big corporations exploit the economy to fit them best, basically creating a positive feedback loop. they get more money, more power and influence on the economy, which gets them even more. take Elon Musk for example. He makes rockets, those rockets give him popularity, and popularity is influence, giving him more money. Big corporations also have hundreds of long loopholes for tax evasion so they can better their feedback loop. All of this power makes a severe difference between the consumers and the producers. As Andrew Tate once said "even if i saved every single penny i ever earned in my entire lifetime and eating or paying taxes i still wouldn't be able to buy a Bugatti" (a paraphrase of Andrew Tate.) The producers have the potential to become mega-corporations, but people working for a mega corporation (or any form of corporation) will never be rich. That's why the average Joe isn't a millionaire. The more you rely on a mega-corporation for you stuff, the bigger their business will become and you are more likely to stay in the middle/lower class. Please note that what andrew tate said is correct, but i am not supporting or disapproving him.
