Who is David Ricardo from The Worldly Philosophers and what is their importance?

David Ricardo was a stockbroker with an interest in economics. He tried to explain why certain groups in society moved up and down the economic ladder, and he found the answer in grain prices and rents. Ricardo had his own business and became quite wealthy, but he was also very interested in the theoretical aspects of economics. He then authored Principles of Political Economy. As a result, Ricardo was responsible for formulating the theory of rent and the theory of comparative advantage, which is the basis for international trade theory. Ricardo died in 1823.