Michael Walzer

Book:

1. Spheres of Justice

He gave the concept of Complex Equality.

Complex Equality:

1. A communitarian account of equality
2. All cultural communities/societies have distinct spheres of distribution
   
3. Distribution of social goods in separate distributive spheres on the basis of different principles, procedure and criteria
   
4. Monopoly over one social good within a distributive sphere is not allowed to dominate the distribution of a good in other sphere – conversion of one good for other blocked 
   
5. Possession of one social good and related status/standing is not undermined by nonpossession of other social good in other sphere