Why had both China and Japan closed themselves off from foreign trade in the 17th and 18th centuries? What were they afraid would happen if they let foreign traders in?

bye cutting off more workers so the graph can go back up

capitalism is an economic system that works around the concept of wealth creation in the pursuit of economic growth for the nation while mercantilism focuses on wealth accumulation through extraction of wealth which they believe is measured by the amwount of gold bollions that the nation has in its possession.