Last week I posted an article titled The statistical argument for trading down in the draft.
One of the problems with the central argument was that it treated the NFL draft much like the stock market or other primary or secondary trade markets. In the stock market, which was the central model that the 538 article started with, buyers and sellers are trading stocks, which have the characteristics of commodities.
In economics, the term commodity is used specifically for economic goods or services that have full or partial but substantial fungibility; that is, individual units are essentially interchangeable, and each of its parts is indistinguishable from another part.