The Genetics of Happiness
Baseline happiness can arguably be negatively correlated to competitiveness, drive and success.
Or not, because people who are depressed feel like it doesn't matter what they do, life's going to suck anyways. They may also respond to their constant unhappiness by looking for artificial mood boosters, which can lead to alcoholism or drug use. They frequently also fail to recognize the value of their accomplishments. By contrast, a happier person is more likely to trigger their brain's reward mechanisms when they do something productive, so they're likely to repeat the behavior.
And it's also worth noting that it's unclear to what degree "drive" and "competitiveness" has to do with "success": The best predictor of a person's level of educational attainment is their parents' educational attainment. The best predictor of athletic success is genetic advantages like height, eyesight, and weight. Artistic success has a fair amount to do with whether a kid's artistic efforts were encouraged or discouraged early on. Most of the really wealthy people in the US inherited a significant amount (Paul Allen is the exception on this front, not the rule).
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/9lRXd9Y1C70/the-genetics-of-happiness
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