If you're prepared to countenance a world where all people live a comfortable life, then you're implicitly countenancing a world where all people have equal worth - monetarily and otherwise.
A world where all people have equal worth is a world where nobody has anything, because there will always be someone who will trade their worth for present pleasures and then have less than everyone else.
It is possible to have a perfectly unequal world where everyone is comfortable, and one entity controls everything. Indeed, something approximating this is the idealised equilibrium that underpins what 'a good capitalist society' could look like, if faeries were real.
The idea in practice is that the people who make the best decisions get all the wealth, so resources are productively utilised, then anyone who wants something does enough wok to produce it (but working in their own area instead of building it themselves).
The problem in the modern era is stuff like the 2008 financial crisis, where the mechanisms to take money away from idiot capitalists (ie, bankruptcy of major corporations) have been short-circuited and disabled.