Comparing wages across countries can be challenging. To address this, Orley Ashenfelter came up with the Big Mac Index, a measure of the number of minutes it takes for a McDonald's worker to earn enough money to buy a Big Mac sandwich.
For example, it takes a worker in India 195 minutes to earn enough to buy a Big Mac, versus only 27 minutes in the U.S. The Index yields many insights about worker productivity and economic growth.
Orley Ashenfelter is the Joseph Douglas Green 1895 Professor of Economics at Princeton University