Oliver Hart and Bengt Holmström were awarded the 2016 Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel for their fundamental contributions to contract theory. This article offers a short summary and discussion of their path breaking work.

We develop a model of competition among socially motivated microfinance institutions (MFIs), where the MFIs offer repayment-based incentive contracts to credit agents. The agents gather information regarding a borrower, and may, or may not collude with the borrower, taking bribes in return for...