I meant in the terms of value dsitribution (which is a bit different than wealth distribution). One can only accumulate wealth in a capitalist system providing things of value to others. If you do not provide values to others, you get nothing in return.
In a kleptocratic system, this is not needed, which is why most capitilists really want to be kleptocrats instead, but kleptocracy is not capitalism.
Socialism, at least, does not require you to give anything of value to another in order to receive something of value in return. If you are sick, or disabled, or poor and alone and young, you will get assistance. This helps insure stability, because it gives people sureness that even if they someday find themselves unable to offer things of value, they will still be taken care of, and is why most countries are not completely capitalist - people LIKE that safety net.
But the feudal aristocracy worked off the same system - you did NOT need to offer things of value to get things in return. And no matter how much you offered in return, there were things you could not get that others could not lose.
A merchant could NOT buy their way into becoming a noble (at least not by common feudalist standards, but exceptions are always made in extreme circumstances).
A noble could never LOSE being a noble, no matter how little of value they offered.