I wonder what would happen if you could somehow decouple businesses running critical infrastructure from the stock market. For example, make it so shares must b

I wonder what would happen if you could somehow decouple businesses running critical infrastructure from the stock market. For example, make it so shares must be held for at least 3 years before they are sold if you don't want to pay a massive extra tax on them, and you can't borrow/lend against these shares.