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Why cap and trade could backfire

Credits remove stigma – and may increase pollution.

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Environmentalists claim that capping greenhouse-gas emissions and creating a market for emissions trading – a policy prescription called "cap-and-trade" – would reduce carbon dioxide output and with it the risk of global warming.

But it could achieve the opposite.

Here's how: By turning carbon emissions into commodities that can be bought and sold, cap-and-trade policies could remove the stigma from producing such emissions.

In the late 1990s, Israeli researchers Uri Gneezy and Aldo Rustichini performed an experiment that provides a useful model. They chose six random day-care centers in Haifa at which parents sometimes arrived late to pick up their children. Intending to reduce the frequency of tardiness, the two imposed a fine on late parents. Mr. Gneezy and Mr. Rustichini explain that, typically, "when negative consequences are imposed on a behavior, they will produce a reduction of that particular response." But the experiment did not produce the anticipated results. Instead, the incidence of late arrivals increased.

In fact, the percentage of parents who were late more than doubled.

Behavioral law and economics help explain this counterintuitive result.

Prior to the imposition of the fine, parents – recognizing it is wrong to make a teacher stay past normal hours with their children – experienced feelings of guilt and shame when they were late. In other words, some parents were motivated to arrive on time by the stigma attached to arriving late. Imposing the fine reduced the stigma. The fine created a good, and a market where none previously existed. Parents were no longer "arriving late," but rather, purchasing extra child-care hours.

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