Imagine a big slide at the playground; that's what happened to the stock market after Mr. Trump added new taxes on things.
Important companies like Apple and a place called Nvidia lost lots and lots of money because of this news.
The money in America even got a little weaker, like a shrinking balloon, and oil prices went down too.
Even though grown-ups said these taxes are bad, Mr. Trump said they're good and that everything will be okay.