“It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.”Adam Smith · The Wealth of Nations · 1776
Individual self-interest, coordinated by the market, produces collective well-being.
Every seller wants to earn money, so they try to make good products at a good price so you choose them. Without anyone planning it directly, the whole town ends up fed, clothed, and supplied. Smith called this the invisible hand of the free market.
Adam Smith observed that self-interest works better than kindness in the market. When a baker makes tasty bread, he is not thinking about your hunger, but about his profit. However, for this to work, the market must be free and competition real. For example, if one baker controlled the whole town, he could sell bad bread at high prices. Without competition, self-interest no longer feeds the city — it starves it.
Why it matters The idea remains the core argument for market economies around the world.