Insurance II Mutual Insurance in the Village Economy
🔍 PART 1: Why Is Insurance Important?
The Problem: Income Fluctuations and Risk Aversion
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In previous lectures, it was shown that risk-averse households prefer to have stable consumption over time.
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However, poor households often can’t borrow, and their savings are limited.
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So if their crops fail or income drops unexpectedly, their consumption also drops, possibly to extreme levels.
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The big question: Can mutual insurance within a village help smooth consumption across time?
👩🌾👨🌾 PART 2: A Simple Insurance Model
The Setup: Atif and Bibir
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Two farmers: each has a 50% chance of earning either Rp 1000 (low income) or Rp 2000 (high income).
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Outcomes are independent (one can succeed while the other fails).
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They have no access to credit or savings.
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Each wants to maximize expected utility, and because utility is concave (u(y)), they dislike variability.
Case 1: No Insurance (Isolated)
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Expected income: 0.5 × 1000 + 0.5 × 2000 = Rp 1500.
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Expected utility: E[u(y)] = 0.5 × u(1000) + 0.5 × u(2000).
Case 2: They Share Incomes
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Now they pool income and each receives the average income each time.
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Four possible outcomes:
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Both get 1000 → total = 2000 → each gets 1000.
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One gets 1000, other 2000 → total = 3000 → each gets 1500.
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Both get 2000 → total = 4000 → each gets 2000.
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Their expected utility improves because sharing smooths consumption.
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This is an application of Jensen’s Inequality:
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E[u(y)] < u(E[y]) when u(.) is concave.
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🔁 PART 3: Extending and Understanding Mutual Insurance
1. Repeat the Insurance Every Period
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They share income every year, which provides ongoing consumption smoothing.
2. Would They Still Need Insurance if They Had Credit/Savings?
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If people could freely borrow and save, they could self-insure.
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In such cases, mutual insurance may be less needed.
3. How Is Insurance Different from Credit?
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Insurance: Payments are based on current needs, not past contributions.
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Credit: Repayment is based on what you borrowed before.
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This distinction is key when evaluating real-world arrangements.
☔ PART 4: Can Everyone Insure Each Other?
Perfect Correlation Problem
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If everyone faces the same shock (e.g. drought hits all farmers), then:
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Everyone is poor at the same time.
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No one can help anyone else.
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So mutual insurance fails when income shocks are aggregate.
👥 PART 5: Strength in Numbers – Adding More People
More Households, Better Insurance
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If we have N farmers, each with independent income risks:
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Their average income stabilizes over time.
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Thanks to the Law of Large Numbers, their combined income becomes predictable.
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So, they can perfectly smooth income.
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Key assumption: independent risks. If all farmers are hit by the same drought, this doesn’t work.
🧪 PART 6: Real-World Data – ICRISAT Villages in India
Data from 3 Villages Over 10 Years
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40 households per village were followed.
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Households:
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Farmed different crops.
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Had land in different areas.
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Faced different exposure to weather.
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This meant household income was not highly correlated.
Two Main Questions:
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Are incomes highly correlated?
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Do people pool incomes (i.e., does consumption move together)?
📈 PART 7: Evidence on Income and Consumption
Income Data
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Plotting income (Yhj^t − Yj^t):
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If incomes are highly correlated: all household income lines would move similarly.
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If not correlated: lines will diverge and wiggle independently.
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Result: Income lines are not very correlated → scope for insurance.
Consumption Data
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Plotting consumption (Chj^t − Cj^t):
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If perfect insurance: all consumption lines should be flat (everyone shares equally).
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If no insurance: lines would wiggle a lot like income.
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Result: Consumption is much smoother than income, suggesting partial risk-sharing.
🌍 PART 8: Evidence from Côte d’Ivoire (Deaton Study)
Test of Perfect Insurance
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Regression of consumption changes on both:
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Village income changes (common shock)
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Individual income changes (idiosyncratic shock)
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Regression Equation:
ΔChj = α + βΔYj + γΔYhj + error
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If perfect insurance:
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γ = 0 → individual income shocks don’t affect consumption.
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Result:
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γ ≠ 0 → partial insurance only.
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🚫 PART 9: Limits to Informal Insurance
Why doesn't full insurance happen?
1. Adverse Selection
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Riskier people are more eager to join → drives good members away.
2. Moral Hazard
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People may put in less effort if they know they'll be "bailed out".
3. Imperfect Observability
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Hard to know someone’s real income → people might lie.
4. Imperfect Enforcement
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After a good year, someone might refuse to share.
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But they face a long-term cost: exclusion from the network.
⚖️ PART 10: Blending Insurance and Credit
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In some communities, insurance is state-contingent credit.
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Example from Nigeria (Udry): loan repayment depends on both past behavior and current income.
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This is a mix of credit and informal insurance.
🌤️ PART 11: Market-Based Insurance
Formal Insurance Products
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Weather-index insurance: pays based on rainfall, not individual losses.
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Accident/life insurance: based on observable events.
Karlan-Udry Experiment in Ghana
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Tried selling rainfall insurance and credit.
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Found:
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It changed risk-taking behavior (e.g. farmers invested more).
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But demand for insurance was low.
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Why? Maybe lack of trust, complexity, or misunderstanding.
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📌 FINAL TAKEAWAYS
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Informal mutual insurance works in villages to smooth some risk—but not all.
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Income is not perfectly correlated, which helps insurance work.
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But insurance is not perfect due to trust, enforcement, and behavioral limits.
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Market insurance may help, but adoption is low—possibly because of behavioral or institutional barriers.
📊 Slide 1 – Title Slide
“Insurance Part 2”
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This is the continuation of the lecture on consumption smoothing and risk.
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The topic will explore alternative mechanisms to savings and credit, focusing on mutual insurance.
📉 Slide 2 – Recap of Last Time
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Savings and borrowing were discussed as tools for smoothing consumption.
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However, borrowing constraints (e.g., limited access to credit) reduce people's ability to protect themselves from income shocks.
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Even when people save a large part of their marginal income (up to 80% in some cases), they still suffer sharp consumption drops (up to 40%).
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For the poor, a 40% drop can mean missing meals—a serious welfare concern.
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Hence, alternative forms of risk protection are needed—enter mutual insurance.
👥 Slide 3 – Informal Insurance: Concept
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Introduces the idea of informal risk sharing or mutual insurance.
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The intuition: If two people’s incomes are not perfectly correlated, they can share income.
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This helps both achieve more stable consumption despite income fluctuations.
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The lecture will explore how effective such arrangements can be, starting with a simple 2-farmer model.
🔄 Slide 4 – Setup of the Two-Farmer Model
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Two farmers with independent and identically distributed (i.i.d.) income shocks.
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Each farmer can earn either $1,000 or $2,000 with equal probability.
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The farmers are risk averse, meaning they prefer a guaranteed average income (e.g., $1,500) over a 50/50 chance of $1,000 or $2,000.
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They have no access to savings or borrowing, so we focus only on mutual insurance as a risk-smoothing mechanism.
📈 Slide 5 – Expected Utility without Insurance
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If each farmer consumes only their own income, expected utility is:
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Because of risk aversion, this expected utility is lower than utility from consuming a certain amount (e.g., $1,500).
🤝 Slide 6 – Mutual Insurance: Equal Sharing
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Farmers agree to pool income and split it equally:
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If one gets $2,000 and the other $1,000, they both consume $1,500.
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In any case, each farmer’s consumption is always $1,500.
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Expected utility becomes:
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This utility is higher than the expected utility from the uncertain income—thanks to Jensen’s inequality.
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Because utility functions are concave, the utility of the mean > mean of the utility.
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🧠 Conceptual Takeaway (from Slides 1–6):
Mutual insurance allows households to reduce income risk by sharing, leading to higher expected utility—especially in the absence of formal credit or savings mechanisms.
🔁 SLIDE 6: More Properties – The Role of Correlation
🎯 Main Idea:
Insurance works best when income shocks are independent across people. But in real life—especially in villages—this is often not true.
📌 What the transcript says:
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So far, the model assumes independent incomes—if you earn 2000, it doesn’t affect whether your friend earns 1000 or 2000.
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But in a real village, there are common factors that affect everyone:
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Weather (e.g., drought, flood)
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Crop disease
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Local market collapse
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Local factory closure
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Price drops for commonly grown crops
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These are called aggregate shocks: they hit the entire community at once.
⚠️ Implication:
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If everyone's income falls together, then mutual insurance won’t help, because no one has extra income to share.
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In contrast, idiosyncratic shocks (personal, individual shocks) can be insured against—e.g., only your crops failed while others did fine.
👥 SLIDE 7: Strength in Numbers – Large Groups and Risk Pooling
🎯 Main Idea:
If shocks are independent across people, then larger groups provide better insurance.
📌 What the transcript says:
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If you have n individuals and each person experiences an independent income shock:
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Everyone pools their income each period.
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Each member receives the average income of the group.
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Thanks to the Law of Large Numbers, as n increases:
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The variation in average income decreases.
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Risk is “averaged out”, and people’s consumption becomes more stable.
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🧮 Mathematically:
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Variance of average income shrinks at a rate of 1/√n.
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Example:
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If you have 100 people: variation is 1/10th of individual income variation.
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If you have 1000 people: variation is 1/30th.
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✅ Conclusion:
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With many members and independent shocks, you get near-perfect risk smoothing.
But this only works if incomes aren’t correlated—i.e., there are no large aggregate shocks.
🧮 SLIDE 8: Informal Insurance and Income Fluctuations?
🎯 Goal:
To formally describe what affects a household’s income, and to understand what parts of that income can be insured against.
📘 The Income Equation:
Where:
Component | Meaning | Type of shock |
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Household fixed effect (e.g., wealth, skill, location). | Permanent, predictable | |
Average national or economic condition (e.g., national growth, inflation). | Broad, time-based | |
Village-level (aggregate) shock (e.g., local drought, village-wide welfare). | Aggregate shock | |
Household-specific (idiosyncratic) shock (e.g., cow dies, illness). | Idiosyncratic shock |
🔺 The professor also notes a fifth element not included in the equation:
A predictable trend in a household’s income over time (e.g., a growing business).
Not a shock—so not insurable—but could be added with a time-varying term for .
🧠 Why this model matters:
This breakdown allows us to:
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Separate what can be insured (the shocks) from what can’t or doesn’t need to be insured (fixed, predictable parts).
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Study how well informal insurance mechanisms in villages respond to:
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Idiosyncratic shocks (should be insurable via mutual help)
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Aggregate shocks (harder to insure in the same group)
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💡 Additional Insight:
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Even within households, insurance can fail.
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Example: Spouses don’t always pool income perfectly.
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So, if we don't see full insurance within families, expecting it across villagers may be even more unrealistic.
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✅ Summary of the Income Decomposition:
Term | Can be insured? | Description |
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❌ No | Permanent household differences (wealth, skill) | |
❌ No (global) | Broad economic context; everyone faces it | |
❌ Hard | Village-wide shock; hard to insure locally | |
✅ Yes | Individual risk (e.g., crop failure, illness) |
🔍 SLIDE 9: What Are We Really Insuring?
🎯 Main Issue:
If we say households "pool their income," what does that really mean?
Do we:
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Pool everything, including permanent differences in income (like wealth, education, skill)?
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Or do we only pool the risky (unpredictable) parts—the shocks?
📘 Components of Income (again):
Where:
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= National or time-based effect (common to all)
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= Permanent household difference
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= Village-level shock
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= Idiosyncratic shock
🔑 Key Ideas from the Lecture:
1. What should be pooled in insurance?
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Not or : These affect everyone, no need to share.
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Not necessarily (permanent difference):
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This raises philosophical and fairness issues.
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Was that wealth "earned" or just "luck"?
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When did the insurance relationship begin?
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2. Social contract matters:
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If people started as equals and one got ahead by chance, maybe that should be covered by insurance.
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If differences are seen as earned or deserved, people may feel they shouldn’t have to share.
3. To simplify the analysis, the lecture assumes:
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Everyone starts equal → focus only on idiosyncratic shocks .
📌 Final Point:
Under this simplification, perfect village-level insurance means:
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Each household shares the average of the shocks.
This removes individual risk but not shared or fixed factors.
🔍 Key Point: Two Conditions for Informal Insurance to Work Well
1️⃣ Sufficient Idiosyncratic Risk
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The more income variation that comes from idiosyncratic shocks , the more potential there is for insurance.
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If most variation is due to common shocks or , then:
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Everyone experiences the same up/down swing.
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No one can help anyone—there’s nothing to insure.
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➕ Example:
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Everyone gets a welfare check → no one needs help.
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Everyone hit by drought → no one can help.
2️⃣ Trust and Enforcement
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Even if there's a lot of idiosyncratic variation, insurance only works if people actually share.
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If trust is low, people won’t cooperate.
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You might help someone today, but if you don’t trust they’ll help you tomorrow, you won’t do it.
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This breaks down informal contracts.
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✅ Summary:
To have effective informal insurance in a village, both must be true:
Condition | Why it matters |
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Sufficient idiosyncratic shocks | Creates something to insure |
Sufficient trust/cooperation | Ensures people actually share |
📊 SLIDES 10–15: Testing for Informal Insurance in Real Data
🧪 Data Context
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Three villages in South India (Aurepalle, Shirapur, Kanzara).
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About 40 households per village, observed over 10 years.
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This dataset is small but very carefully collected.
🔍 Why good data matters:
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Informal insurance is about variation (not averages).
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Measurement error (e.g., incorrect consumption reports) looks like insurance failure.
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So we need high-quality data to avoid mistakenly concluding that insurance doesn't exist.
📐 The Empirical Test Setup
The regression model:
Where:
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: Household consumption
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: Village average income
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: Household’s own income
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: Random, idiosyncratic consumption shocks (e.g., family travel)
🤝 Two Extreme Cases:
1. Perfect Insurance
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Everyone pools income, and gets the same share.
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So consumption only depends on average income.
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Expected regression results:
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2. No Insurance
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Households rely only on their own income.
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Expected regression results:
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⚖️ Real-World Expectation
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In practice, we expect partial insurance, so:
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should be between 0 and 1
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should also be between 0 and 1
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The closer β is to 0, the more risk is smoothed away via sharing.
❗ Complication: Multicollinearity
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If individual income is highly correlated with village average income, it’s hard to separate their effects in regression.
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This statistical issue makes it hard to determine how much insurance is happening, even if it's present.
✅ Summary
Term | Meaning |
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Effect of village average income on household consumption | |
Effect of household's own income on their consumption | |
Perfect insurance scenario | |
No insurance (fully self-reliant) scenario |
📊 SLIDES 11–15: Empirical Evidence from ICRISAT Villages
🔍 Objective:
Check if income shocks are idiosyncratic and whether consumption is smoothed across households—which would suggest mutual insurance is at work.
1️⃣ Checking for Income Correlation
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Slide 11 asks: How correlated are village incomes?
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The plots show income variation over time for different households.
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If lines for all households move together, it means shocks are aggregate.
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If they move in different directions, shocks are idiosyncratic.
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📌 Observation: In the data, income lines move differently across households, which means there's idiosyncratic variation—good for insurance possibilities.
2️⃣ Why Idiosyncratic Shocks Occur (Even Within Villages)
From the transcript:
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Microclimate differences: Some land reacts better to rain than others.
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Different income sources: Some families do construction work, others farm.
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Household-specific luck: E.g., one gets a temporary job, another doesn’t.
✅ These are reasons why even in a small village, income shocks differ across households—making mutual insurance theoretically useful.
3️⃣ Realism of “No Savings” Assumption
A student asks: Is it realistic to assume people don’t save or borrow?
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The professor clarifies: We don’t assume no savings. Instead:
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We test how well consumption tracks income.
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If consumption is smoother than income, something—insurance, savings, borrowing, aid—is helping.
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The test doesn’t claim to detect only informal insurance. It shows whether smoothing is happening, regardless of mechanism.
✅ Summary:
Step | Purpose |
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Check income movement | Look for idiosyncratic variation—needed for mutual insurance |
Understand sources of variation | Identify why households might experience different shocks |
Analyze consumption vs. income | Check if consumption varies less than income → evidence of smoothing |
Not just insurance | Smoothing could be due to borrowing, aid, or savings, too |
📉 SLIDES 15–18: Income vs. Consumption Variation
🧪 What’s Shown on the Slide?
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The chart plots consumption minus village average consumption (i.e., mean-centered consumption).
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This transformation sets the village average to zero, so we can clearly see variation across households.
🔍 Observation:
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Compared to the earlier income charts, the consumption lines are much flatter.
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This suggests that even though incomes vary a lot, consumption does not—indicating smoothing is happening.
📐 Regression Interpretation
The regression is of the form:
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In the slides, this is also written as:
(Same idea: just different letters for coefficients.)
Results from the data:
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,
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That means:
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Average village income explains consumption (as expected with insurance).
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Own income has little effect → suggests households are smoothing risk.
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💬 Discussion in the Transcript
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The professor emphasizes that short-run insurance seems strong.
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What’s unknown from this data:
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Whether households build up debt over time instead of informal insurance.
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Whether there's a long-run transfer of wealth behind the smoothing.
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🧠 Example: If one household always helps others and is never repaid, this might look like insurance in the short term—but in the long run, that household is effectively financing the rest of the village.
✅ Summary Takeaways
Observation | Implication |
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Flat consumption lines vs. income lines | Evidence of consumption smoothing |
Regression: | Own income doesn't drive consumption much |
Good short-run insurance | But unclear if it’s truly mutual, or debt-based |
Income variation ≠ Consumption variation | Indicates informal risk-sharing is working—at least in part |
📊 The Regression Framework
We are estimating:
Where:
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: Household consumption
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: Household income
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: Village-year dummy (represents village-wide conditions, like average income)
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: Measures how much own income affects consumption
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: Other household-specific consumption variation
🧪 Empirical Approach
Step 1: Regress consumption on own income without village-year dummy
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Find
Step 2: Regress consumption on own income with village-year dummy
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Find
✅ Interpretation:
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Including the dummy doesn’t change the estimate much.
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So village-level income has little additional explanatory power.
🔍 Key Insight: What Should Happen with Insurance?
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If perfect insurance were present:
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Village income would matter more than own income.
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So adding the village dummy would reduce the beta on own income significantly.
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But here, beta stays high, even with the dummy.
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So most of the consumption variation is driven by own income.
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→ Little risk-sharing is happening in these villages.
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❗ Side Note on Omitted Variable Bias
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When you omit a relevant, correlated variable (e.g. ), its effect loads onto the included variable (e.g. ).
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But since adding the dummy doesn't change the beta much, we conclude:
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The omitted factor wasn’t driving consumption in the first place.
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✅ Summary Takeaways
Question | Interpretation |
---|---|
Does consumption depend more on own income or village income? | Own income (suggests limited insurance) |
Does adding village-year dummies change results? | Not much → village effects are minor |
Conclusion | Not much informal insurance in this setting |
📊 The Key Regression Framework
We want to estimate the effect of own income and village average income on household consumption:
Where:
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: Household consumption
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: Village average income
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: Household’s own income
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: Effect of village income → should be high under good insurance
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: Effect of own income → should be low under good insurance
🧪 The Côte d’Ivoire Evidence
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The Côte d’Ivoire study runs this regression using high-quality panel data.
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Then, it drops from the regression to test for omitted variable bias:
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The logic: if is important, then omitting it should inflate .
✅ What they find:
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Including or excluding makes very little difference to .
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This suggests:
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Village average income has little impact on consumption.
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Insurance (if any) is weak.
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Households mainly consume based on their own income.
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📚 Econometric Insight: Omitted Variable Bias
The professor explains:
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If you omit an important variable (e.g., village income) that is positively correlated with an included variable (e.g., own income), the effect of the omitted variable will be falsely absorbed by the included one.
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This leads to overestimation of the included coefficient (here, ).
✅ Summary Takeaways
Concept | Interpretation |
---|---|
Village income omitted → unchanged | Village income not important in explaining consumption |
unchanged → weak insurance | Households depend more on own income |
Test logic | If mattered, dropping it would inflate |
🔁 What Is Being Explained?
The professor is discussing how to test whether village-level factors affect household consumption using two equivalent approaches:
📐 Regression 1: Use Actual Average Income
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is the average income in village at time .
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If is large, it implies that village income helps explain consumption → evidence of mutual insurance.
🆚 Regression 2: Replace with a village-time dummy
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is a fixed effect for each village-year combination.
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It picks up everything that’s constant across households in that village at that time—including , welfare programs, local rainfall, etc.
✅ Key Insight: Both approaches capture village-time variation, so they should yield similar results if is important.
🔍 What the Data Shows
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Including or excluding village average income or village-time dummies does not meaningfully change the coefficient on own income ().
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Therefore, village-level factors—including insurance effects—do not significantly explain consumption.
✅ Final Takeaways
Concept | Implication |
---|---|
Village fixed effect = average income | Both capture village-time variation |
Coefficient doesn’t change when added | → No major omitted variable problem |
Own income still explains consumption | → Weak or no mutual insurance present |
Fixed effects provide a general test | A powerful way to check for unobserved group-level influences |
🔁 Mutual Insurance Is an Informal Contract
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Informal insurance relies on mutual trust and expectations, not legal enforcement.
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There are no courts or binding agreements—just the belief that:
“I’ll help you now, because I believe you’ll help me later.”
⚖️ Multiple Equilibria
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The outcome of informal insurance depends on expectations:
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If I expect you’ll help me later, I help you now → Good equilibrium
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If I don’t expect help later, I don’t help now → Bad equilibrium
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So, both cooperation and breakdown are self-reinforcing outcomes—both can be equilibria in the same social setting.
💡 Application to India vs. Côte d’Ivoire:
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India: Households seem to operate in a cooperative equilibrium—they help each other and smooth consumption.
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Côte d’Ivoire: Households may be in a non-cooperative equilibrium—they don’t help each other, perhaps because trust or expectations broke down.
⚠️ Informal Insurance Is Fragile
The professor highlights three reasons for its fragility:
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No enforcement: If one household breaks the norm, others may stop helping too.
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Social mobility: If people begin to move away or leave the village, they exit the informal network—breaking down long-term reciprocity.
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Pessimism: If I think others won’t help me in the future, I won’t help today—leading to collapse of cooperation.
🧠 Conceptual Takeaway
Informal Insurance | Formal Insurance |
---|---|
Based on trust, norms, and expectations | Based on legal contracts and enforcement |
Can be very effective | Can be less flexible, but more reliable |
But is fragile and equilibrium-dependent | More stable and enforceable |
Final Thought:
Informal insurance isn't always weak. It can be strong—but it’s conditional on optimism, stability, and enforcement through social norms.
This final section of the lecture shifts from informal mutual insurance to formal market insurance, particularly focusing on index insurance in developing countries.
Let’s break it down:
📦 What Is Market Insurance?
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Formal insurance sold by companies.
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Relies on contracts—you pay premiums, and you get payouts under certain conditions.
🔍 Key Challenge:
In many low-income settings, insurance is sold not based on your actual loss, but on easily observable external events, like rainfall levels.
This is called:
Index Insurance – You get paid if a weather index (e.g., rainfall) crosses a threshold, not based on your specific situation.
🛠️ Why Index Insurance?
Because market insurers:
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Don’t observe effort (did you try hard to save your crop?)
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Can’t verify personal losses easily (moral hazard + asymmetric information)
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Want to avoid manipulation and fraud
So they tie payouts to objective measures (rainfall < 20 inches), not individual outcomes.
❌ Why It’s Problematic:
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Neighbors in mutual insurance see your actual effort and hardship.
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A company can’t see that—so it might deny claims even when a farmer truly suffered.
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People may also distrust the data (“who’s measuring rainfall?”).
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Villagers may not understand the mechanism, leading to low take-up, even if the product is good.
📊 Empirical Findings from Ghana:
A randomized experiment tested willingness to pay for index insurance.
Price (Ghanaian Cedis) | Take-up Rate |
---|---|
0 | 100% |
9.5 (break-even price) | ~37% |
12 | Near 0% |
Even when actuarially fair or slightly subsidized, demand was very low.
🎯 Why Low Demand?
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Trust issues – Unclear who measures rainfall or whether data is accurate.
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Complexity – Hard to grasp index-based payouts.
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No visible relationship between need and coverage – “I suffered, but rainfall was high, so I get nothing.”
💡 But It Works If Taken
Those who received insurance (especially when bundled with credit) showed:
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Increased investment (e.g., fertilizer use)
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Decreased hunger (fewer household members missed meals)
Conclusion:
Insurance works well for risk management and investment if people take it up. But the challenge is convincing them to buy it.
🏛️ Role of Government
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Governments might subsidize premiums to improve take-up (e.g., like Obamacare).
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Public-private solutions are being explored to bridge the gap between good products and low adoption.
🔁 Summary Table
Feature | Informal Insurance | Market Insurance (Index) |
---|---|---|
Enforcement | Social norms | Legal contracts |
Customization | Highly personal | Impersonal, index-based |
Trust requirement | High trust, but local | Requires trust in institutions |
Flexibility | High (neighbors observe effort) | Low (objective rules) |
Fragility | Fragile (expectation-based) | More stable |
Take-up challenges | Social breakdowns | Complexity, mistrust, pricing |
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