“Most of the world” is definitely not petite bourgeois (which is what “middle class” is supposed to mean), neither in the west nor elsewhere. There are only ~36E6 small businesses in the US, many of which share owners and some of which are just shell companies. Even if we assume that every small business was owned by a single person, it’s still only 10% of the population, in the “most entrepreneurial” country in the west.