In pricey Switzerland, a McDonald’s Big Mac costs $6.81 on average. The same sandwich sells for only $4.20 on average in the United States. And in India it goes for only $1.62. (The Indian version is the “Maharaja Mac,” which is made of chicken rather than beef because of local sensitivities.)

These price differences are analyzed in The Economist’s Big Mac index, which compares the price of Big Macs around the world. UBS has developed a similar index measuring how long it takes an average worker in a given country to earn enough money to buy a Big Mac.....

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