Beyond that, the effect of money on happiness depends on how happiness is defined.

FORBES: How Much Happiness Can Money Buy?

Perceived happiness depends on a lot more than material welfare.

ECONOMIST: Measures of well-being

Your happiness depends upon it.

FORBES: Control Freaks: You're Perfect Just The Way You Are

Because career success depends so heavily on happiness and attitude, you need to treat these factors differently, and not just as two more parts of an overall risk-mitigation model.

FORBES: For Career Decisions: Maximize Risks Instead of Managing Them

Mill recognized however that what constitutes happiness (and its lesser cousin contentment) is completely subjective, and depends on who you ask.

FORBES: The Happiest (And Saddest) Countries In The World

The pursuit of happiness, with happiness defined in the classic sense of justified and lasting satisfaction with life as a whole, depends on economic liberty every bit as much as it depends on other kinds of freedom.

WSJ: Charles Murray: Why Capitalism Has an Image Problem