Repeat After Me: Always Adjust for Inflation. Always Adjust for Inflation.


Over at Wonkblog, Lydia DePillis shows us the chart on the right, which comes from a recent study of the effect of corporate mergers on the price of beer, and says this:

This looks like a scary graph of beer price increases. The researchers determined, though, that the rise is largely not attributable to consolidation in the industry; there may be other factors at play.

Urk! What this really shows is the result of inflation. I’ve overlaid in red the CPI for food and beverages since 2007, and beer prices match it exactly. The economists who wrote the study may have used nominal prices in their chart instead of real prices because that’s what they needed as input for their statistical manipulations, but this is a classic case of why you have to watch out for this kind of thing. What the researchers say they found is that the merger of Miller and Coors produced a 2 percent increase in prices that was offset by a 2 percent decrease in transportation costs, but that has nothing to do with the increase you see in the chart. That’s all inflation.

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FACT:

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Today, reader support makes up about two-thirds of our budget, allows us to dig deep on stories that matter, and lets us keep our reporting free for everyone. If you value what you get from Mother Jones, please join us with a tax-deductible donation today so we can keep on doing the type of journalism 2020 demands.

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