It kinda sounds like you haven't really read my post if you conflate the existence of an upper middle class with the political power such a class holds in shaping how society is organized. The story of the post-war era is not the disproportionate power of billionaires, but the disproportionate power of the professional and managerial class. It's not billionaires that make healthcare expensive, but overpaid doctors, nurses, and hospital bureaucrats.