The Economist.
The first Big Mac was sold in 1967.
McDonald's Big Mac, it's more than just another hamburger.
Now, it's available in more than 100 countries around the world.
But wherever you go, it still tastes pretty much the same.
Two all beef patties, special sauce, lettuce, cheese, pickles, onions
on a sesame seed bun.
That makes the Big Mac a dream for weary travelers
looking for a familiar meal.
And it also makes it very helpful for something else.
The Economist magazine has come up with a simple way to measure purchasing power
across countries.
It's Big Mac Index.
For 40 years, our correspondents have been munching their way around the world
as a way to understand currencies, exchange rates, and purchasing power.
From Switzerland, how much is it?
740.
740.
Okay.
To Hong Kong.