The economists, Daniel W. Sacks, Betsey Stevenson and Justin Wolfers, found that the relationship between income and happiness is logarithmic.

FORBES: Mom Was Wrong: Money Does Buy Happiness. There's Research To Prove It

The high point has to be Betsey Stevenson, the former chief economist of the Labor Department, expressing the surprising view that U.S. companies used to employ Americans out of generosity.

FORBES: Sunday Times Offers Food For Thought On Gas, Capital And Unions

In 2008, economists Justin Wolfers and Betsey Stevenson, both of the University of Pennsylvania, published a paper where they reassessed the Easterlin paradox using new time-series data.

FORBES: Jeff Sachs and the Economics of Happiness

Betsey Stevenson, an economist at the University of Pennsylvania's Wharton School and former chief economist at the U.S. Labor Department, said that for some women, greater career ambition means less free time and a decline in overall happiness.

WSJ: Women Set New Goals for Careers and Lives

Using 35 years of data from the General Social Survey, two Wharton School economists, Betsey Stevenson and Justin Wolfers, made the case in 2009 that women's happiness appeared to be declining over time despite their advances in the work force and education.

WSJ: Has the Sexual Revolution Been Good for Women? Mary Eberstadt: No