I’m sorry you’re under the impression that the economy is controlled equally by tens of thousands of corporations. Its much more like 2 dozen control nearly all money that presently exists.

There are 8 million businesses in the U.S. We have problems with monopolization, but to the level where a cross-economy price fixing scheme could possibly be implemented, we are not at that point. That's an extraordinary claim requiring extraordinary proof, not something to just believe dogmatically because you don't like capitalism.

I also have no fucking clue what you mean when you say that not fixing prices is in their best interests??

You could start by just asking me. This is basic game theory. Market price of a good is 10 dollars, ACME and BLLC corp meet and fix prices at 15 dollars. ACME corp goes to market at 15 dollars, BLLC corp goes against the secret agreement and goes to market at 10 dollars. BLLC gets ACME corp's customers as long as they retain their price at 15. Now take the same example and spread it across hundreds, thousands of companies, keeping in mind that this level of coordination would leave behind proof, witnesses, and take an extraordinary level of coordination. Non-participation in a price fixing cartel for a minority company could mean capturing the entire market, and anyone who was participating would immediately be incentivized to exit it.

This is what is being posited, versus the dirt simple explanation that more money has been printed and has thus decreased in value. And we know a ton of money was printed.

Price-fixing cartels aren't impossible, however, they do become completely impossible to create or maintain at a scale like that. There is simply way too much competition.