What Is the Big Mac Index? A Fun Guide to Purchasing Power

In 1986, The Economist introduced one of the most creative economic indicators ever devised: the Big Mac Index. The idea is disarmingly simple — since McDonald's makes a Big Mac to roughly the same recipe in over 70 countries, comparing its price worldwide should reveal whether currencies are overvalued or undervalued.

Nearly four decades later, the Big Mac Index remains one of the most widely cited (and enjoyed) tools for understanding purchasing power parity.

How the Big Mac Index Works

The principle behind the index is straightforward:

1. Record the price of a Big Mac in local currency for each country.
2. Convert all prices to US Dollars using current exchange rates.
3. Compare: if a Big Mac costs more in one country than another (in USD terms), that country's currency may be overvalued. If it costs less, the currency may be undervalued.

For example, if a Big Mac costs $5.69 in the United States and 480 yen in Japan, the implied exchange rate would be:

480 ÷ 5.69 = 84.4 yen per dollar

If the actual market rate is 150 yen per dollar, the index suggests the yen is significantly undervalued against the dollar — meaning your dollars buy far more burgers (and many other things) in Japan than at home.

What Is Purchasing Power Parity?

The Big Mac Index is a lighthearted test of purchasing power parity (PPP), an economic theory that says exchange rates should eventually adjust so that identical goods cost the same in every country. In reality, this rarely holds perfectly because of factors like:

• Labor costs — Wages vary enormously between countries, affecting the price of services and locally produced goods.
• Rent and real estate — A McDonald's in central Tokyo pays very different rent than one in rural Thailand.
• Taxes and tariffs — Import duties on beef, VAT rates, and other taxes shift prices.
• Ingredient sourcing — Not all ingredients are globally traded; local supply and demand matters.
• Non-tradable inputs — Electricity, water, and local regulations are priced locally.

Despite these limitations, PPP is a fundamental concept in international economics and helps explain why a coffee in India costs a fraction of what you'd pay in Switzerland.

What the Index Reveals (and What It Doesn't)

The Big Mac Index is best understood as a conversation starter, not a trading signal. It reveals broad patterns:

• Currencies in lower-income countries almost always appear undervalued because labor and rent are cheaper there.
• Commodity-linked currencies (like the Norwegian Krone) can appear overvalued because high incomes push up local prices.
• The index tends to be more useful for comparing similar economies — for instance, the US versus the Eurozone — than vastly different ones.

It doesn't account for differences in menu composition, portion sizes, or local taste preferences. Still, it remains a remarkably intuitive way to think about currency valuation.

Beyond Burgers: Six Indexes on FXMap

On FXMap, we extend the Big Mac concept to six purchasing power indexes, each telling a slightly different story:

• 🍔 Big Mac Index — The classic. How much does a burger cost in 50+ currencies?
• ☕ Latte Index — Coffee prices reflect local service-sector wages and cafe culture.
• 🚕 Taxi Ride Index — A 5 km taxi fare captures transport costs and regulation.
• 🥤 Coca-Cola Index — A globally standardized product, priced locally.
• 🍿 Movie Ticket Index — Entertainment pricing reflects disposable income levels.
• ⛽ Gasoline Index — Fuel prices vary wildly due to subsidies, taxes, and oil production.

Click any country on the map to see how all six indexes compare for that destination.

How to Use This for Travel Planning

The practical takeaway? If the Big Mac Index shows a country's currency is undervalued, your travel budget will stretch further there. Check the index for your destination before you go:

1. Open the FXMap and select your home currency.
2. Click your destination country to see the exchange rate.
3. Scroll down to the purchasing power section to see how many burgers, lattes, or taxi rides your money buys compared to home.

It's a much better guide than the raw exchange rate alone.