Another pillar of market coordination is specialisation. When people focus on tasks in which they are relatively more productive and trade with others, total output can rise. Adam Smith illustrated this with the famous pin factory: dividing labour into simple steps raised productivity dramatically compared with each worker making whole pins alone.
Trade between individuals, regions, and countries extends the same logic. Voluntary exchange occurs when both sides expect to be better off. Comparative advantage — the idea that even a less productive party can gain by specialising in what it does comparatively best — is a standard teaching tool in economics classrooms worldwide.
Gains from trade do not mean that every person gains equally in every period, or that transition costs are zero. Education on the invisible hand includes adjustment, competition, and the political economy of open markets, not only the textbook diagram of mutual benefit.