Last Updated on Wednesday, 7 April 2010 12:42 Written by admin Wednesday, 7 April 2010 12:42

Purchasing power parity (PPP) is a theory of long-term equilibrium exchange rates based on relative price levels of two countries. The idea originated with the School of Salamanca in the 16th century [1] and was developed in its modern form by Gustav Cassel in 1918.[2] The concept is founded on the law of one price; the idea that in absence of transaction costs, identical goods will have the same price in different markets.

Last Updated on Wednesday, 10 February 2010 09:07 Written by admin Wednesday, 10 February 2010 09:00

The Economist uses the price of the ubiquitous McDonald’s meal to calculate the “Big Mac Index”, a guide showing how far from fair value different world currencies are. The Big Mac theory (a.k.a. purchasing-power parity, or PPP) says that exchange rates should even out the prices of Big Macs sold across the world.

The implied PPP shown in the table is the exchange rate that would make a Big Mac cost the same abroad as it does in the USA. When you compare actual exchange rates with the implied PPP rate, you will see that most currencies are trading way above or below the US dollar, meaning that they are over- or undervalued. Keep in mind that PPP is a long-term indicator, pointing to where currencies ought to go in the future. (It’s also best to use it only to measure currencies between countries that are at a similar stage of developmen