Burgernomics
Since 1986, The Economist magazine has been running the light-hearted Big Mac Index to measure exchange rates. Based on the theory of purchasing-power parity (PPP), Burgernomics finds out how much a Big Mac costs in different countries, and thereby deduces whether and by how much a country’s currency is overvalued or undervalued.
The rational minds might object that the cost of a Big Mac cannot reflect exchange rates, as it is much influenced by number of KFCs, number of obese citizens, number of mad cows, or the existence of certain Monsieur Jose Bove. Nevertheless, Big Mac brings a vivid and fatty touch to the dismal science.