While this is generally true, it's also not the entire equation. For example, there's no gain without risk.
- When I work for someone else, I am offloading some of the risk to that person/owner. When someone starts a company and hires other people... if the company goes belly up, the founder loses their investment; the workers find another job.
- When I rent from someone else, I am offloading the risk of owning a property to someone else. If I get a job across the country, I don't need to sell my house at a loss to move.
None of this justifies people making insane amounts of money while others are starving. But neither should the worker expect to reap all the benefit unless their also willing to take all the risk.