When it is slow enough, that's called a culture shift. Your piano seller wants change fast enough to call it personal profit. Mass-produced pianos require mass

When it is slow enough, that's called a culture shift. Your piano seller wants change fast enough to call it personal profit. Mass-produced pianos require mass media as local changes won't pay off the cost of the production machinery. Might as well stay with local craftsmen. "Communication-based centralization" includes Louis XIV of France's centralization at Versailles, yes?