A nation's wealth is measured by its productive output, not its stock of gold

Smith opens by attacking the mercantilist assumption, common among European governments of his time, that national wealth consists of accumulated precious metals, and that policy should therefore aim to maximize exports and minimize imports to keep gold flowing inward. He argues this confuses money, a mere medium of exchange, with wealth itself, which actually consists of the goods and services a country's labor and land produce each year.

By this reasoning, a country obsessed with hoarding bullion while neglecting productive capacity is poorer in any meaningful sense than one with modest reserves but a thriving, efficient economy generating real goods. Smith uses this distinction to challenge trade restrictions designed purely to protect metal reserves, arguing they often shrink the very productive capacity that creates genuine prosperity.

This reframing set the terms for how economists would think about national wealth for centuries afterward, shifting attention from treasuries to output, consumption, and productive capacity as the true measures of a nation's economic health.

Takeaway: wealth is what you can make and use, not what you can lock in a vault.