Looking for an article in Behavioral Economics about Inequality
Although your description is very detailed, there is plenty of research on this topic. I think you are looking for this current published paper:

Starmans, Christina &amp; Sheskin, Mark &amp; Bloom, Paul. (2017). Why people prefer unequal societies. Nature Human Behaviour. 1. Article number 0082. doi:10.1038/s41562-017-0082.

This paper covers the latest research about inequality. If its not the specific one you are searching for, please look at its 102 references and let us know.