Arbitrage is a risk-free way of making money by exploiting the difference between the price of a given good on two different markets—it’s the proverbial free lunch you were told doesn’t exist. In this equation, the undervalued good in question is hog meat, and McDonald’s exploits the value differential between pork’s cash price on the commodities market and in the Quick-Service Restaurant market. If you ignore the fact that this is, by definition, not arbitrage because the McRib is a value-added product, and that there is risk all over the place, this can lead to some interesting conclusions. (If you don’t want to do something so reckless, then stop here.)