What economic concept did Adam Smith advocate for in his writings?

Adam Smith advocated for laissez-faire capitalism in his writings, particularly in his seminal work "The Wealth of Nations." This concept emphasizes minimal government intervention in the economy, allowing free markets to regulate themselves through supply and demand. Smith believed that individuals pursuing their own self-interest would inadvertently contribute to the overall economic well-being of society, a principle often referred to as the "invisible hand."

His ideas laid the foundation for classical economics and promoted the idea that economic prosperity arises from competition and free trade, which are hallmarks of a capitalist system. In contrast, other options like utilitarianism, socialism, and mercantilism represent different economic philosophies that either promote government intervention, collective ownership, or state control over commerce, none of which align with Smith's vision of a free-market economy.