Amartya Sen 
Inequality Reexamined [PDF ebook] 

This book brings together and develops some of the most important economic, social, and ethical ideas Sen has explored over the last two decades. It examines the claims of equality in social arrangements, stressing that we should be concerned with people’s capabilities rather than either their resources or their welfare. Sen also looks at some types of inequality that have been less systematically studied than those of class or wealth.