I'm not economist. Maybe tariffs could work. (It seems like most of the experts say they don't. And how they were determined certainly seems especially dumb) However, it doesn't take a genius to see that enacting them without advance notice to prepare for them is the worst way to do it. Give companies time to prepare. Give countries time to negotiate. The result would be the same without the uncertainty and chaos. Unless this really is some plan for the rich to short stocks and make a killing in the market, I don't see how this implementation would be a good idea to anyone.