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.
Portrait of David Ricardo by Thomas Phillips.jpg The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labour which is necessary for its production, and not on the greater or less compensation which is paid for that labour.
David Ricardo about the comparative advantage in free trade. It is believe, that Free trade will raise the standard of living to all those who participate in it. What we do know is that fee trade rises the standard of living of those who are power full, more advance, more developing in a free trade relationship.