Rules governing the activities of private-sector enterprises. Regulation is often imposed by government, either directly or through an appointed regulator. However, some industries and professions impose rules on their members through self-regulation. Regulation is often introduced to tackle market failure. Externalities such as pollution have inspired rules limiting factory emissions. Regulations on the selling of financial products to individuals have been introduced as protection against unscrupulous financial firms with better information than their customers. Rate of return regulation and price regulation have been used to combat natural monopoly, sometimes instead of nationalization. Some regulation has been motivated by politics rather than economics, for instance, restrictions on the number of hours people can work or the circumstances in which an employer can dismiss employees. Even when introduced for sound economic reasons, regulation can generate more costs than benefits. Regulated firms or individuals may face substantial compliance costs. Firms may devote substantial resources to regulatory arbitrage, which would leave consumers no better off. Regulation may lead to moral hazard if people believe that the government is keeping an eye on the behavior of the regulated business and so do less monitoring of their own. Regulation may be badly designed and thus lock an industry into an inefficient equilibrium. Rigid regulation may hold back innovation. There is also the danger of regulatory capture. In short, then, regulatory failure may be even worse for an economy than market failure.