This is hard to accept when there is empirical evidence refuting you. Extreme statism gave us mass murder, (along with the world's worst pollution in history) extreme free markets gave us the Industrial Revolution.
For the slow people on this thread, the Industrial Revolution was the fastest ever increase in standard of living for the highest number of people in the history of the world.
If it were true, then only a select few would have benefited from the Industrial Revolution. While a select few received enormous benefit, the increase in standard of living reached almost everyone.
Great fortunes cannot be created alone. Bill Gates has the $50B, but 14,000 Microsoft employees have over $1M. In captialism, the creation of great fortunes benefits a great number of people.
There is no economic reason to "keep people down" in a free market; in fact, it's impossible. Labor is a commodity.
What the introduction of socialist tendencies invariably does is limit the extremely capable from progressing as fast as they could, therefore diminishing opportunities for benefit across multiple strata.