I noticed an interesting thing the other day. Why does the same item cost completely different in various countries? Five dollars for a burger in the States, but in India, you can buy the same for three dollars. It’s not just coincidence — here, the concept called purchasing power parity, which economists refer to, works.

Purchasing power parity is essentially a way to understand how much your currency is really worth in different parts of the world. Not at the official exchange rate, but based on how many goods you can actually buy with it. Coffee in Brazil, sneakers in Germany, a smartphone in Japan — all of this helps reveal the real picture.

At its core, it’s based on a simple principle: if there are no trade barriers, the same product should cost the same everywhere when converted at the exchange rate. It sounds logical, but in practice, it’s more complicated. Taxes, shipping, local demand — all influence prices. That’s why economists look not at a single product, but at a whole basket: food, clothing, housing, energy. Comparing this basket shows the actual strength of a currency.

Why is this even important? When calculating a country’s GDP, purchasing power parity allows for a fairer comparison of different economies. Take India. By the nominal exchange rate, GDP per capita looks low. But if you consider purchasing power parity — meaning the cost of living is cheaper there — the picture is quite different. People actually live better than the raw numbers suggest.

The IMF and the World Bank use adjusted figures based on purchasing power parity for this reason. It helps see the true distribution of wealth in the world, not just nominal figures.

An interesting example is the Big Mac Index. Economists noticed that hamburgers are roughly the same everywhere, but prices differ. If a Big Mac costs five dollars in the US and three dollars in India — that immediately shows the relative value of currencies. Then, indices for iPads, KFC, and other standard goods appeared. A simple way to understand how purchasing power parity works in real life.

But there are also problems. The quality of the same product can vary in different countries. Non-tradable goods — real estate, local services — can differ greatly in price. Plus, inflation can flip everything in just a few months. What was relevant yesterday might already be outdated today.

And where it gets especially interesting is in cryptocurrencies. Bitcoin and other cryptos are global assets, not tied to a single country. But in countries with weakened currencies, purchasing power parity shows that crypto can be a truly useful tool. When local currency loses value, people turn to cryptocurrencies and stablecoins to preserve their purchasing power. This is especially evident in countries experiencing hyperinflation.

Stablecoins in such places are not just speculation — they’re a real way to protect your money. And purchasing power parity helps understand whether it’s even worthwhile to switch from the local currency to cryptocurrencies.

In general, purchasing power parity is a powerful tool for understanding how people really live in different countries. Not perfect, of course, but a fair way to compare economies. Whether you’re a trader, an analyst, or just a tourist curious about why things are cheaper or more expensive abroad — this concept can help you make sense of it.