The job market for mbas has slowed since the recession, but a diploma still pays off. Graduates of the top 25 programmes make almost $160,000 a year after five years, two and a half times what they earned pre-MBA, according to our 2013 Best Business Schools ranking. But are they happier, too? We asked 3,500 grads five years out of the top 50 schools to rate their satisfaction with their education, with the preparation it gave them and with their current job. Weighing the scores they gave, we found that Stanford, the nation’s most selective school, also has the most satisfied graduates.