On the Principles of Political Economy and Taxation

Published in 1817, 'On the Principles of Political Economy and Taxation' is David Ricardo's most well-known work.

It outlines his labor theory of value, which posits that the value of a good is determined by the labor required to produce it.

The book also introduces the concept of comparative advantage, arguing that countries benefit from international trade by focusing on goods that require fewer resources to produce.

Ricardo critiques earlier economists like Adam Smith and discusses the impact of taxation, machinery, and other economic factors on different classes of society.

His work has had a lasting influence on economic theory and policy, particularly in the areas of free trade and the distribution of wealth among landlords, capitalists, and workers.