An Inquiry into the Nature and Causes of the Wealth of Nations by Adam Smith

The classic of economics, first published in 1776. According to Wikipedia: "Adam Smith (baptised 16 June 1723 – died 17 July 1790 [OS: 5 June 1723 – 17 July 1790]) was a Scottish social philosopher and a pioneer of political economy. One of the key figures of the Scottish Enlightenment, Smith is the author of The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations. The latter, usually abbreviated as The Wealth of Nations, is considered his magnum opus and the first modern work of economics. It earned him an enormous reputation and would become one of the most influential works on economics ever published. Smith is widely cited as the father of modern economics and capitalism."