The framers of the Declaration of Independence evidently believed that happiness could be achieved, putting its pursuit up there alongside the unalienable rights to life and liberty. Though governments since then have seen life and liberty as deserving of vigorous protection, for all the public policies aimed at increasing economic growth, people have been left to sort out their happiness.
This is an unfortunate omission. Despite all the wealth we have accumulated — increased life expectancy, central heating, plasma TVs and venti-white-chocolate-mocha Frappuccinos — true happiness has lagged our prosperity. As Bobby Kennedy said in a speech at the University of Kansas in March 1968, the nation's gross national product measures everything "except that which makes life worthwhile."
The era of laissez-faire happiness might be coming to an end. Some prominent economists and psychologists are looking into ways to measure happiness to draw it into the public policy realm. Thirty years from now, reducing unhappiness could become another target of policy, like cutting poverty.
"This is another outcome that we should be concerned about," said Alan Krueger, a professor of economics at Princeton who is working to develop a measure of happiness that could be used with other economic indicators. "Just like G.D.P."
It might be a bit of a political challenge to define happiness as a legitimate policy objective. Imagine the Republican outrage when the umpteenth tax cut didn't do the trick. Democrats would likely slam the effort as regressive, distracting from efforts to improve the lot of the less fortunate by more conventional measures — like income.
Happiness is clearly real, related to objective measures of well-being. Happier people have lower blood pressure and get fewer colds. But using it to guide policy could be tricky. Not least because we don't quite understand why it behaves the way it does. Men are unhappiest at almost 50, and women at just after 45. Paraplegics are not unhappier than healthy people. People who live with teenagers are the unhappiest of all.
Happiness seems fairly cheap to manipulate. In one experiment, subjects were asked to answer a questionnaire about personal satisfaction after Xeroxing a sheet of paper. Those who found a dime lying on the Xerox machine reported substantially higher satisfaction with their lives.
Most disconcerting, happiness seems to have little relation to economic achievement, which we have historically understood as the driver of well-being. A notorious study in 1974 found that despite some 30 years worth of stellar economic growth, Americans were no happier than they were at the end of World War II. A more recent study found that life satisfaction in China declined between 1994 and 2007, a period in which average real incomes grew by 250 percent.
