David Ricardo - a British political economist and one of the most influential of the classical economists, along with Thomas Malthus, Adam Smith, and John Stuart Mill. His theory of comparative advantage, which suggests that a nation should concentrate solely on those industries in which it is most internationally competitive, trading with other countries to obtain products which are not produced nationally.
File:David Ricardo - Title page to On the Principles of Political Economy and Taxation by David Ricardo, published 1817. The book concludes that land rent grows as population increases. It also presents the theory of comparative advantage, the theory that free trade between two or more countries can be mutually beneficial, even when one country has an absolute advantage over the other countries in all areas of production.