Rand's Undervaluation by 50% Highlighted in Latest Big Mac Index

The most recent update to The Economist’s Big Mac index provides compelling evidence that the rand is potentially undervalued by 50%. This index compares the prices of McDonald’s Big Mac hamburgers in various countries to assess the relative value of currencies.

The underlying principle of this index is the idea that a similar product, such as the iconic Big Mac, should have a consistent cost across countries. Any disparity in price points indicates a potential misalignment in the value of the local currency. This index has been a reliable indicator of currency valuation trends since its inception in 1986.

A Big Mac costs R49.90 in South Africa, while the same burger costs $5.58 in the United States. As a result, the implied exchange rate is 8.94. When this is compared to the current exchange rate of 17.78, The Economist concludes that the South African rand is currently undervalued by 49.7%. This figure is notable because it represents an improvement over the 55% undervaluation observed a year ago. Over time, the South African rand has consistently been one of the world’s most undervalued currencies, and this undervaluation was particularly pronounced in 2020, at 70%.

However, it is important to note that other currencies are currently outperforming the rand in terms of undervaluation. Currencies such as the Indian rupee (-55%), Egyptian pound (-53%), and Taiwanese dollar (-57%) are currently undervalued. The rand’s recent value decline against the dollar, amounting to more than 10% in the last year, can be attributed to the impact of significant increases in global interest rates. South Africa’s allure has historically been rooted in its provision of significantly higher interest rates than developed markets such as the United States, making investments in the rand appealing. However, the situation has changed as aggressive US rate hikes have narrowed the interest rate differential.

Furthermore, the rand’s trajectory is inextricably linked to commodity prices, which have fallen in recent months. This decline is exacerbated by South Africa’s strong ties to Russia, which contributes to the currency’s current position.

In addition to identifying undervalued currencies, the Big Mac index also detects overvaluation in some cases. The euro (+4%) and Swiss franc (+39%) are both marked as overvalued against the dollar, demonstrating the diversity of currency trends on the global stage.