institutions like pension funds, investment funds are the ones who buy the market or buy the stock they own. ie if tsla stock is falling or is a good investment. insiders or current shareholders can buy there is no need for the gov't to play 'market maker' or become a reluctant 'investor' the gov't becomes the richest investor or buyer in the 'open market' communism: gov't owns everything.
you have 'academics' and gov't bureaucrats who are suggesting gov't policy and have no clue how the 'markets' operate. she probably thinks the market is fair, orderly, and 'regulated markets' in the exhange the market manipulatd, unfair, and corrupt okay. full o fraudulent investment scams and in order for a scams to work, there is some investments like 5% of the listed equities is investable. vast majority of the equities listed is scams and ripoffs okay