I don't see how this really works any more because a Big Mac is different in different countries. It's not an "identical" product being compared. You can use McDonald's own local nutrition calculators to confirm this. A Big Mac in the US is 550 calories, yet 508 calories in the UK (522 in Russia and a mere 498 in Switzerland, for comparison). Is it factored into the index that British fast food fans are getting 7.6%…
Burgernomics was never intended as a precise gauge of currency misalignment,
merely a tool to make exchange-rate theory more digestible. Yet the Big Mac
index has become a global standard, included in several economic textbooks
and the subject of dozens of academic studies. For those who take their fast
food more seriously, we also calculate a gourmet version of the index.