prices. This can be explained by different tax treatments. See also Big Mac index Christmas Price Index Equal pay for equal work KFC Index Hemline index Men's underwear index Price Price discrimination Price dispersion Rational pricing Recession index Search theory Supply and demand References Further reading Benn Steil & Dinah Walker, Move Over Big Mac: The Law of One Price Is Lovin' Our Little Mac Index, Geo-Graphics, Council on Foreign Relations (February 25, 2015) Kenneth Rogoff, Kenneth Froot & Michael Kim, The Law of One Price Over 700 Years, International Monetary Fund Working Paper (WP/01/174) (November 2011) Economics laws Arbitrage Management cybernetics