Christopher Snowdon reviews the efficacy and fairness of sin taxes aimed at preventing obesity. He finds that at low levels of taxation, consumers don’t change their behavior appreciably, and when they do abandon the taxed foods, it will often be in favor of other high-calorie choices. Very high levels of taxation may be needed to bring about significant public health benefits, but here the evidence is sparse, because few jurisdictions have tried taxation at these levels. Moreover, all such sin taxes are regressive; they hurt the poor disproportionately and become justly politically unpopular. Snowdon concludes that sin taxes aimed at obesity are an ineffective public policy tool, even on their proponents’ own terms.
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