With this they can determine the difference in living costs, the price of burgers, iPhones, hotel rooms, rental cars, a bottle of Coca Cola (or a beer), fashion items etc.
For instance, we learn that buying a pair of Levi's jeans in Australia is almost twice as expensive than to buy them in the US. And it's more than twice as expensive to buy in France.
On the other hand, using public transportation in Moscow, Russia only costs 16% of what it costs in New York, USA.
And buying a new Volkswagen Golf in Singapore is almost 500% more expensive than pretty much anywhere else on the planet.
Also, buying a Big Mac in Denmark is twice as expensive as buying a Big Mac in Poland, which is just insane considering that our two countries are so close to each other.
Health insurance is another big one, with health insurance in the US being more than 7 times as expensive as in Canada, and five times as expensive than in Germany.
They also have their 'Weekend Getaway Index', which is defined as two nights at a standard 5-star hotel room, four meals, two snacks, car rentals for two days, two pints of beer, four liters of soft drinks/water , and a bit of shopping (purchase of a pair of jeans and a pair of sports shoes).
Here it is twice as expensive in Australia, 50% more expensive in the UK, and 30% more expensive in France than in the US. On the other hand, Canada is really cheap.
It's quite a fascinating study.
You can find the full document here with all the many pricing comparisons: