In short, manpower, poor people do the dirty work, but the rich work with their brains and their money, which is why they earn more. No matter what it is connected to, poor people can't also buy their needs if they haven't been employed by those rich people, and rich people can't earn a single profit without the manpower that is coming from poor people.
Let's say you purchased a share from the company of Elon, which only the rich can afford. If the company is successful, the rich also gain more profit, and guess what? Those employees received an increase. No, the managerial people or supervisors received the raise, not those below who keep their hands dirty and just take orders from above.
That's true and without the poor the rich can't get a successful business so in as much as the rich just sit and get more money it only shows that the poor at least have something to hold on to with their pay they can't depend on street begging, at the moment there problem have been solved.
The rich only need the poor as in manpower to make more money, without the manpower that business will crumble even if it's Elon musk.