Study in IIM Ahmedabad gives more return than Harvard,Stanford.This report published by The Economist magazine.The top indian business school get Fourth rank among 20 business school in the world.
The most prestigious schools of US and rankings-
Harvard- 17
Stanford-18
Chicago-14
Booth-13
Respective ROI after one year-
IIM Ahmedabad-44%
Harvard-15%
Stanford-14%
Chicago-18%
Booth-20%
Though it is old result but it looks better.
Source-http://www.bloncampus.com/