There has been much debate about the best policies for reducing carbon emissions. The most common refrain heard from economists is simply that incentives matter: if gas prices increase, people will consume less gasoline (by driving less), and alternative fuels will become more feasible substitutes (by having a more competitive price).
While an increase in the gas tax remains a point of contention, not only among economists, but also among politicians and policy wonks, now supporters of a gas tax have another reason to offer to strengthen their argument: an increase in the price of gas will most likely lead to a less obese population.
In a recent research paper, Charles Courtemanche, an economist at the University of Washington, St. Louis, provides the empirical support. He writes,
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