In 1986, The Economist magazine created the term, the Big Mac Index. It was meant as an unscientific guide. For example, how much does a Big Mac cost in Paris vs the same Big Mac in Mexico City. Using the theory of purchasing power parity (PPP) one could compare the economic standards of any two countries.
We had a personal experience in Jerusalem. J.J. and I each had a sandwich. When we were asked to pay the equivalent of nearly US$20 each, we were a little taken aback. The two of us thought perhaps we were also paying for the tourist guide’s sandwich. The price apparently is correct for Jerusalem, one of the most expensive cities in the world.
Very interesting reading on the Big Mac Index that Jerusalem is No. 1 on their list.