The stock market is largely collapsing because: 1.) Hedge funds levered up their capital 5 - 15x to make more money, then got caught with their pants down. So they all panic sold at once, crashing the market. 2.) CEOs of large corporations used cash to buy back their stock, inflating the stock price, and depleting their cash reserves. So now those same companies are on the brink of collapse, causing the credit market…
But even if they were banned, these companies wouldn't just have piles of cash reserves sitting around. To remain competitive, they would've had it invested in resources like additional personnel that would've gotten the axe either way when the belt has to be tightened.
There needs to be better financial planning and regulations - a lot of them.
But the best thing that could've helped here is better planning for national emergencies like a pandemic. Bill Gates and others have been clamoring for a long time about these dangers and we should've taken them more seriously.