This report explores evidence and insights from five case studies that have made significant recentprogress in addressing the challenge of insuring poor smallholder farmers and pastoralists in thedeveloping world. In India, national index insurance programmes have reached over 30 million farmersthrough a mandatory link with agricultural credit and strong government support. In East Africa (Kenya,Rwanda and Tanzania), the Agriculture and Climate Risk Enterprise (ACRE) has recently scaled to reachnearly 200,000 farmers, bundling index insurance with agricultural credit and farm inputs. ACRE

We show theoretically that the presence of basis risk in index insurance makes it a complement to informal risk sharing, implying that index insurance crowds-in risk sharing and leading to a prediction that demand will be higher among groups of individuals that can share risk. We report results from Ethiopia from a first attempt to marketweather insurance to informal risk-sharing groups.