Indirect Wage-Mediated Insurance Externalities

In Simple Words

Imagine a fleet of taxi drivers in a city where fares drop drastically whenever it rains heavily. If a third of the taxi drivers buy rain insurance and receive a cash payout on rainy days, those insured drivers choose to stay home and rest instead of driving. Because there are far fewer taxis on the road, the remaining uninsured drivers can charge higher fares to passengers. Thus, the uninsured drivers receive an indirect financial cushion simply because their peers held rain insurance.

Research question

Uninsured agricultural wage laborers are highly vulnerable to weather shocks, yet formal microinsurance products are rarely accessible to them. When index insurance is provided to a subset of local wage workers, their decision to reduce labor supply during drought payout periods raises equilibrium wages, indirectly insuring uninsured peers in the same market.

Participants

3,678 landless agricultural wage workers aged 25–49 across 42 treatment villages in India.

Study Design

Two-stage clustered RCT measuring within-village equilibrium wage effects of laborer insurance offers during delayed-monsoon payout events.

Results

A 10% increase in the proportion of wage laborers offered insurance raises village wages by 24.7% in payout states. Insured laborers receiving payouts worked 15.4 fewer days and had a 28.5 percentage point lower labor market participation rate than uninsured peers.

Takeaway

Account for labor-supply-driven wage spillovers when evaluating the cost-effectiveness and broader welfare impacts of microinsurance interventions in informal labor markets.

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Plain-English glossary

Original explanations, informed by the references below. Examples are illustrations, not data from the studies above. The research text stays unchanged.

Percentage points

The difference between two percentages.

ExampleA rise from 40% to 50% is 10 percentage points. Relative to the starting value, that is a 25% increase.

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Randomized controlled trial

A study that uses chance, like drawing lots, to decide who receives each option being compared. Researchers compare the groups’ outcomes to estimate the effect of those options.

ExampleA lottery assigns volunteers to a training programme or a comparison group. Researchers then compare their outcomes.

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