In The Wealth of Nations, the reader will find an approach to one of the most important works of the twentieth century and that undoubtedly still remains today. A pleasant and different way of approaching this classic of economic thought. The wealth of nations is considered the most important work of Adam Smith, because in it he analyzes carefully - not only from the economic prism, but also social, historical and moral - the economy of his time, criticizing especially the mercantilist system prevailing. Likewise, Smith advocates an uncommon system of free market at that time, but without a doubt in force and studied thoroughly today, more than two centuries after its publication.