Better-off

Laborers in the emerging underclass who cater to the whims of the better-off are sometimes referred to as “wealth workers."

Source: tatoeba (8322716)

I feel like people that are better-off have a moral obligation to help those in need, whether it be out of compassion or otherwise.

Source: tatoeba (10744253)

Only the better-off nations can afford to send probes into space.

Source: wiktionary