A sugar tax is socially beneficial, a new study finds

Sugar taxes are on a high. Around 40 countries and seven American cities have started to tax sugary drinks, mostly in the past few years. Supporters say such levies compensate for the costs imposed on health services by higher rates of obesity, diabetes and heart disease. They might also help short-termist buyers avoid the long-term consequences of sugary indulgences. Opponents counter that such levies are a fun-killer, souring people’s pleasure, and regressive, because poorer people spend a bigger share of their incomes on soft drinks.

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Two working papers published on May 20th seek to help policymakers find the sweet spot. Hunt Allcott of New York University, Benjamin Lockwood of the University of Pennsylvania and Dmitry Taubinsky of the University of California, Berkeley, compute the “optimal” tax rate that maximises social well-being, taking into account differences in consumers’ income and behavioural biases.

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