Ethics at its best is all about perspective, about standing back from our first order intuitions about a situation or relationship in order to properly appreciate its subtleties and nuances. Its central question is, Shouldn't we think about that too? Economics at its best is all about proportion, about standing back to see how important different aspects of a problem really are when considered as part of a complex system. Its central question is, How much does it matter? Good judgement needs both perspective and proportion, which means that neither ethics nor economics can be very successful if it neglects the skill the other specialises in. (HT The Browser). Source.
Although the story can be more complicated, Sen has done it, the article is very interesting.