## More on Potatoes

Hal Varian writes in in comments:

Paul Samuelson used potatoes as an example of a Giffen good in his Principles of Economics book and drew the well-known implication that they must therefore be an inferior good (i.e., the demand for potatoes falls as income increases.)

One year he got a letter from the Maine Potato Grower Association along with an econometric study that they had commissioned that showed that, in fact, potatoes were a normal good. They suggested that he find some other example to use in his textbook.