[aninhumer]

Wealth inequality is a problem because it is an inefficient distribution of society's resources. When we divert productive capacity to build someone a yacht instead of feeding the homeless, we allow many to suffer in exchange for the marginal improvement in happiness for one person.

It can be argued that inequality leads to more utility being created overall, but I feel this justification is rarely scrutinised in much detail. Instead it is elevated to a moral premise that those who are able to earn more "deserve" their excess share of society's resources, regardless of how many suffer for their consequently smaller share.

Personally, it seems to me we have the resources to feed and shelter everyone in our society, and I'm highly sceptical that doing so would create less utility overall than whatever it is we're doing with those resources instead. Indeed, I wouldn't be surprised if this argument extends to the world as a whole.