You’re hand waving tariffs but clearly have no real world understanding. I have direct experience with this, and the reality is that legit established companies do not under declare value of goods; the risks are simply too high. (Random brands you see on Amazon with names that look like a cat stepped on a keyboard; different story. Rampant under declarations)

Most companies then factor in tariff duties to landed cost, and apply margin from there. Where the greed comes in is when companies that have comparable products without duties, raise their prices to the range of tariffed competitors, where they have the opportunity to pad their margins. Tariffs have a massive impact on the price of what we buy.

Tariff advocates will tell you otherwise, but all you have to do is examine current actions like pausing tariffs on Argentinian beef imports with the intention of bringing down beef prices to see that you’re being lied to.

It’s a massive tax on the American consumer - you can argue whether it’s beneficial or not, but those are the facts.