This document discusses institutions and institutional theory. It begins by outlining the significance of institutions and how they matter for economic development. It then defines institutions and lists some of their key characteristics, including structure, stability, regulating behavior, and shared values. The document also presents a typology of institutional theories, including historical institutionalism, rational choice institutionalism, and normative institutionalism. It provides details on historical institutionalism and how institutions evolve over time through path dependence.