We study the relation between the number of firms and price-cost margins under price competition with uncertainty about competitors' costs. We report an experiment in which two, three, and four identical firms repeatedly interact in this environment. In line with the theoretical prediction,...

Microfinance programs provide poor people with small loans given to jointly liable self-selected groups. Follow-up loans provide incentives to repay. We experimentally investigate the influence of those features on strategic default. Each group member invests in an individual risky project,...