Max Weber's best-known and most controversial work, The Protestant Ethic and the Spirit of Capitalism, first published in 1904, remains to this day powerful and fascinating. Weber's highly accessible style is just one of many reasons for his continuing popularity. The book contends that the Protestant ethic made possible and encouraged the development of capitalism in the West.

The foundation for all modern economic thought and political economy, The Wealth of Nations is the magnum opus of Scottish economist Adam Smith, who introduces the world to the very idea of economics and capitalism in the modern sense of the words.

It can be said of very few books that the world was changed as a result of its publication - but this is certainly the case of Capital: A Critique of Political Economy by Karl Marx (1818-1883). Volume 1 appeared (in German) in 1867, and the two subsequent volumes appeared at later dates after the author's death - completed from extensive notes left by Marx himself.

A collection of essays that discusses such issues as the media, immigration, the minimum wage, and multiculturalism.

An immediate sensation when it was first published in two volumes in 1945, Popper's monumental achievement has attained legendary status on both the Left and Right and is credited with inspiring anticommunist dissidents during the Cold War. Arguing that the spirit of free, critical inquiry that governs scientific investigation should also apply to politics, Popper traces the roots of an opposite, authoritarian tendency to a tradition represented by Plato, Marx, and Hegel.