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Contributed by Daniel Weber, another alert reader from the inscrutable midwest. Garnered from a clipping from the Chicago Tribune of 22 February 1998, in turn spotted by alert reader Daniel at a McDonalds in Manteno, IL. Bits from the article:

THE COST OF A BIG MAC - IN TIME WORKED

How much time does it take to earn enough money to buy a Big Mac? It depends on where you live...

[...]

The global average is 37 minutes, according to the survey by the Union Bank of Switzerland, which used the cost of a Big Mac as its standard because the burger is served nearly worldwide.

[...]