But large corporations can be bought, controlled, and union manipulated by centralized government. That is one critical aspect of Leftism. Siemens, Messerschmidt, etc. were all large corporations controlled by a fascist (leftist) government, likewise in the Soviet Union, Gasprom, and in the US, GM and maybe less obviously GE.
How many US adults out there realize this?
It is free enterprising competition that improves all of us.
Large corporations don't need to be bought, controlled and manipulated by government. They are only too happy and eager to jump in bed with government and together work to insulate against the difficult aspects of competition. Competition and a "free market" are the last things large established corporations want. That is why they routinely support big government candidates, and give huge amounts of money to leftwing crooks who chatter about how bad the capitalists are but take their money and do them favors behind the scenes.
Competition only exists at the small business level, where no one entity can dominate the market for very long, if at all.