What economic idea is Adam Smith most closely associated?

Adam Smith is most closely associated with the idea of the "invisible hand," which suggests that individuals pursuing their own self-interests in a free market unintentionally contribute to the overall economic well-being of society. He argued that when people engage in voluntary exchanges, they help allocate resources efficiently, leading to wealth creation and economic growth. Smith's foundational work, "The Wealth of Nations," laid the groundwork for modern economics and the principles of capitalism.