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The challenge of percent change

David Yanofsky
People are seen through a percentage sign as they stand in front of a shopping window in downtown Cologne
People are seen through a percentage sign as they stand in front of a shopping window in downtown Cologne

Percent change is arithmetic. Determine how much a measure has changed (or perhaps how much it’s expected to change) and divide it by the original level and that’s percent change. Simple enough. Where it gets complicated is how we talk about this arithmetic. In economics, we don’t talk about one percent change, we talk about…

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