On Sugary Drinks, Taxes and Demand Curves

Interesting

Notes On Liberty

A few days ago, I discovered a blog post on the website of Jayson Lusk (a very good agricultural economist whose work has often guided some of my own economic history research given that most economic history is also agricultural history). The post relates to a study of the implementation of a sugary drink tax in Berkeley to fight obesity.

Obviously, a tax will reduce the consumption of any good. That is pretty axiomatic and all that we need to know is how much. In other words, how elastic is demand. If all things are held constant, the quantity consumed relative to the price change will give you that measure.* However, the study that Lusk pointed too basically shows that we often do not hold everything constant.

The authors of the study point out that when tax is passed, there is generally a debate that occurs beforehand. This generates…

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