sciencehabit writes "'Are you better off than you were 4 years ago?' Ronald Reagan's famous question in the U.S. presidential election of 1980 is generally a good yardstick for picking a candidate, or at least for judging a leader's economic policies. But few voters follow it. Instead, they are swayed by economic swings in the months leading up to the election, often ignoring the larger trends. Why are we so shortsighted? A psychological study of voting behavior suggests an answer and points to a simple fix. ... Healy and Lenz challenged their subjects to evaluate hypothetical governments based on slightly varying information. For example, some received information expressed as yearly income while others received the same information expressed as a yearly growth rate. The same information in a plot of steadily increasing average personal income over 3 years—$32,400, $33,100, $33,800—can also be expressed as a steadily decreasing rate of growth—3%, 2.3%, 2.1%. That did the trick. Just changing the units of the data was enough to cure voter fickleness. When economic trends were expressed as yearly income rather than rates of change, the subjects made accurate judgments. But if the same information was expressed as a change over time—the bias reappeared."
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