David Ricardo (18 April 1772 – 11 September 1823) was a British political economist. He was one of the main thinkers behind Classical economics, together with Thomas Malthus, Adam Smith and John Stuart Mill. Today, he is mostly known for his theory of comparative advantage. This theory suggests that a nation should concentrate its resources only in industries where it is "most" internationally competitive and trade with other countries to obtain products not produced nationally. Ricardo promoted the idea of extreme industry specialization by nations, to the point of dismantling internationally competitive and otherwise profitable industries. In this thinking Ricardo assumed the existence of a national industry policy aimed at promoting some industries to the detriment of others. For Ricardo some form of Central Economic Planning was a given.