#OTD in 1776.
Scottish political economist Adam Smith's book The Wealth of Nations, the first modern work in economics, was published.
It has become a fundamental work in classical economics, and has been described as "the first formulation of a comprehensive system of political economy".
https://en.wikipedia.org/wiki/The_Wealth_of_Nations
Wealth of Nations at PG:
https://www.gutenberg.org/ebooks/3300