In his influential Theory of Justice John Rawls speaks of a "difference principle," a way of legitimizing social differences. He imagines people in "an original position" in which they do not know their ultimate social positions.
Unfettered Hope: A Call to Faithful Living in an Affluent Society
It can be hard to keep up with Marva J. Dawn, since she usually produces a book a year. But this one should definitely be on your reading list. Perhaps because Dawn has a new publisher, this book is crisper and more concise than her previous works.
The Good of Affluence: Seeking God in a Culture of Wealth
John R. Schneider
The Consuming Passion: Christianity and the Consumer Culture
Rodney Clapp, ed.
Ministry and Money: A Guide for Clergy and Their Friends