The iPhone X Index: A FX Comparison Tool

The Economist magazine first published the Big Mac Index in 1986 as a novel way to compare currency prices. The premise of the Big Mac Index is based on the theory of purchasing power parity (PPP), which states that the exchange rate between two currencies is equal to the ratio of the currencies' respective purchasing power. While this can be a rather sophisticated academic theory, the Economist made the concept of “bugernomics” more relatable to a widespread audience.

In simplest terms, the “burgernomics” of the Big Mac Index implies that the same good, a Big Mac, should cost the same in any two countries based on current market exchange rates. To use an extreme example, if today’s euro (EUR) / U.S. dollar (USD) exchange rate is equal to 1.16 and a Big Mac in the U.S. costs USD 1.16, then a Big Mac in the Eurozone should cost EUR 1.00. When there is a price difference in Big Macs between two countries, one of the two currencies in the pair is considered under or overvalued.

More specifically, the Economist 2017 update to the Big Mac Index shows that “the average price of a Big Mac in America in July 2017 was $5.30; in China it was only $2.92 at market exchange rates. So the "raw" Big Mac index says that the yuan was undervalued by 45% at that time.” While the Big Mac Index is not a precise approach for valuing currencies and identifying arbitrage opportunities, it is a fun and approachable way for the lay person to learn about foreign exchange valuations.

Click here to explore the Economist’s interactive Big Mac Index

To expand the analysis to other goods and services, FX Initiative has applied the same logic to create the iPhone X Index. For example, the recently released iPhone X is a high demand global product that Apple sells to consumers worldwide in several different currencies. In theory, the same iPhone X should cost the same in any two countries based on current market exchange rates. However, similar to the Big Mac Index, there is a significant variation in U.S. dollar equivalent costs as follows:

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From this simple example, we can see that the best value is purchasing an iPhone X denominated in Japanese Yen, which saves approximately USD 1.00 or 0.10% compared to U.S. dollar pricing. In contrast, the worst deal appears to be purchasing an iPhone X denominated in euros, which would cost an additional USD 369 or 36.9% more. The FX economic misalignment is clear from a theoretical perspective, but practically speaking most consumers will still buy the iPhone X in their local currency.

This article underscores FX Initiative’s mission to make complex foreign currency matters simple and manageable. Our currency risk management training provides educational videos, interactive examples, and webinar events on best practices from leading companies such as Apple. We help global businesses and financial institutions optimize their foreign exchange risk profiles to efficiently and effectively mitigate earnings volatility and preservice cash flows. To get started, take the FX Initiative today!