I wish I could put things as succinctly as this....

Capitalism's core virtue is that it marries altruism and self-interest. In producing goods and services that answer real consumer needs, it secures a profit for producers. Doing good for others turns out to entail doing well for yourself.

Capitalism's success, however, has meant that core wants in the developed world are now mostly met and that too many goods are now chasing too few needs. Yet capitalism requires us to "need" all that it produces in order to survive. So it busies itself manufacturing needs for the wealthy while ignoring the wants of the truly needy. Global inequality means that while the wealthy have too few needs, the needy have too little wealth.