I’ll agree with what others are saying about speculation but I’ll add a few points…

Meme investing. People just buy shit now. You can download Robinhood or any other free app and buy something you read about because you feel like it. That’s a lot different than traditional stock valuation. And in some cases (GameStop?) the public can have such force that it massively overwhelms traditional stock valuation

The other point is that businesses will still function. Will it suck to have a 20+% tariff? Yes. Will in end a massive global corporation? No.