Option 2: Adam Smith -> "An Inquiry into the Nature and Causes of the Wealth of Nations," commonly known as "The Wealth of Nations," was published by Adam Smith in 1776. This seminal work is considered the foundation of classical economics and discusses concepts like division of labor, free markets, and the invisible hand. While it covers broader economic principles, it laid the groundwork for microeconomic analysis by examining individual behavior, markets, and resource allocation. -> correct