Mancur Lloyd Olson, Jr. (pronounced /ˈmænsər/ or /ˈmæŋkər/; January 22, 1932 – February 19, 1998) was a leading American economist and social scientist who, at the time of his death, worked at the University of Maryland, College Park. Among other areas, he made contributions to institutional economics on the role of private property, taxation, public goods, collective action and contract rights in economic development. Olson focused on the logical basis of interest group membership and participation. The reigning political theories of his day granted groups an almost primordial status. Some appealed to a natural human instinct for herding, others ascribed the formation of groups that are rooted in kinship to the process of modernization. Olson offered a radically different account of the logical basis of organized collective action.

This final work by a world-renowned economist will take its place among the classics of political economy Why do some economies do better than others? How does society encourage the kind of market economy that generates continually increasing incomes? How do particular styles of government affect economic performance? World-renowned economist Mancur Olson tackles these questions and others in what will surely be regarded as his magnum opus. Olson contends that governments can play an essential role in the development of markets. Reliable enforcement of private contracts and protection of individual rights to property depend on governments strong enough not to undermine them. His exploration of "market-augmenting governments" will stand as a cutting-edge work on economic growth and provide a useful framework in which to consider the Asian financial crisis and its aftermath. As Susan Lee noted in Forbes, "his pioneering insights might have won a Nobel Prize for Olson had he lived a bit longer." "Power and Prosperity is an important book, written with clarity and verve. It is a great misfortune that Mancur Olson is not here to respond to the debates that it will surely provoke." -The Wall Street Journal