If there are only sellers and no buyers the market collapses entirely. Luckily though people buy and sell stock all the time and even if the entire OMB estimated revenue from the tax (about $500b) was funded by selling stocks, that would represent less than 1% of total market volume.

Hahaha. You think the people in that arena don't re-invest every possible dollar for more growth as soon as it hits their pockets? Cash flow is king to be able to pay for continuing leverage.

A sudden tax bill and the end of acquiring new debt are when massive wealth unravels.

Bubbles die when cash flows dry up.

I think AMZN and TSLA dropping 10% or whatever because Bezos and Elon have to sell more shares could be feelsbadman but it is not very close to the end of the free market economy.