Let's pass a law banning stock trading. When you buy stocks of a company, it will be for life. Your life or the company life, whichever ends first.
So, if you happen to buy a hot stock like Apple, how do you cash out if you cannot sell? No, you don't. What if you think the company is about to go bankrupt? So, you save your skin at the expense of the dumb guy who buys the lousy stock from you? Nope, not allowed. You own it forever, for better or for worse.
OK, maybe we will let you sell, but as a deterrence, let's tax capital gain at 50%. That will teach you. You cry out "What capital gain, I am losing money". Well, we will just tax 25% of the proceed, if you have no gain.
That will slow traders down.
"Old age is the most unexpected of all things that can happen to a man" -- Leo Tolstoy