This document discusses how institutional pressures shape business behaviors. It identifies five key forces that drive businesses to conform to external expectations: regulatory pressures from governments; reputational pressures from public opinion and NGOs; uncertainty that encourages imitation of successful role models; normative pressures from professional networks and standards; and coercive pressures from various actors like professions, peers, and media. The document argues that businesses pursue legitimacy and seek to conform to socially acceptable norms established within their institutional environment and field.