We live an era of Heavily concentrated industries. We have 3 cell phone companies, 1 airplane company, roughly 4 airlines, and the rental industry despite having various competitors are colluding in prices by using a third party to using an algorithm (that they insist on calling ai.) to recommend keeping units vacant to induce a rental shortage and artificially inflate prices. We have 3 major operating systems companies (Linux may be a dying breed but they still exist.).
Price collusion is in fact occurring more and more regularly but the cause is far more simpler.
The current method of business is to inflate the stock price as much as possible at the cost of everything else because most ceo care packages offer stock compensation to circumvent income taxes and ceo pay regulations. So much so they purchase their own stock shares back more so then they spend on research, maintenance, equipment upgrades, or employees.
For our most recent example look no further then Boeing.
Before that Ubisoft, before that EA, before that the insurance industry, and before that the medical insurance industry and that hardly even scratches the surface of the past 5 years much less the dawn of the 1990s with info a few years behind.(that is not intended to be insult in any regard because the way business was conducted dramatically has shifted from the methods of the late 80s early 90s.)
That and lax regulations have allowed even the dregs of business society to run rampant like with crypto and pyramid schemes that I swear are breeding like guinea pigs.