T he vast bulk of economic activity today involves business corporations. Corporations are abstract legal entities that combine legal rights and obligations with a significant degree of flexibility. The legal separation between corporations and their stakeholders, including shareholders, has been important to the success of the corporate form in organizing long-term, large-scale production, while limited liability and the tradability of shares help corporations acquire funds from a broad set of investors.However, this legal separation exacerbates conflicts of interest between those who control corporations and others, including shareholders, creditors, employees, suppliers, customers, public authorities, and the general public. In large corporations, stakeholders vary enormously in the information and degree of control they have on corporate actions. Contracts and markets do not generally create efficient outcomes if markets are not competitive, contracts are incomplete or costly to enforce, or if corporate actions create negative externalities for those with little information or control. Laws and regulations can help alleviate these frictions, but their design and enforcement are also costly and subject to information and control frictions.In recent decades, much emphasis has been placed on aligning the interests of managers and shareholders. Managerial compensation typically relies on financial yardsticks such as profits, stock prices, and return on equity to achieve