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Collier argues that index insurance is best suited to cover disasters which occur every 20 years or greater because severe risks lower premium costs. Below are excerpts form the interview. Q: You have done substantial research, notably with Jerry Skees on index insurance. Why do you think that index insurance needs to be designed as “disaster insurance” rather than “crop insurance”? A: We need a new frame of reference for household markets. Up to now, the consensus focus has been crop yields. Yet the effects of bad weather on household well-being are often multifaceted and poorly captured by