The Big Mac Index puts the rand's implied value at R9.15 to the dollar, roughly 44% below where it actually trades. A Big Mac costs R56.90 in South Africa, or $3.49, against a US baseline of $6.22, while the market rate sits near R16.32.
Local reporters note the rand has consistently traded below its purchasing power parity value because of risk perception, with the country still rated below investment grade at BB by S&P and Fitch and Ba2 by Moody's despite recent upgrades.
Interesting insights on Big Mac Index rand valuation
The Economist publishes a second version of the index that adjusts for GDP per capita, and on that measure the rand is roughly 30% undervalued, implying about R11 rather than R9.15. The reason is the Balassa-Samuelson effect: poorer countries have genuinely cheaper non-tradables, so the labour, rent and electricity behind a Johannesburg burger really do cost less, and the raw index misreads that as currency mispricing.
Academic work on the adjusted index has found it forecasts actual currency moves better than the raw version. Even on the raw number, the rand ranks only the tenth most undervalued, behind the Ukrainian hryvnia and the Hong Kong dollar.
The underlying burger price is also contested: an IOL report on 31 July used R68.30 and arrived at 52% undervaluation. The rand touched R15.19 at the end of May, its strongest in years, from about R18 twelve months ago.
What others are saying about Big Mac Index rand valuation
Daily Investor quotes Efficient Group chief economist Dawie Roodt putting fair value at R15.50 to R16.50, and crediting the Reserve Bank's shift to a 3% inflation target. BusinessTech reports the GDP-adjusted figure of roughly 30%, while IOL notes the index turns 40 this year and that The Economist itself calls it a playful thought experiment.
The number in the headline is the one to ignore
R9.15 is the least informative figure in the story and the one certain to get shared. The Economist has never claimed burgernomics measures misalignment, only that it makes exchange rate theory easier to digest. Adjust for income and the gap roughly halves.
More to the point, the article's own expert puts fair value at R15.50 to R16.50, which is almost exactly where the rand is trading, so the honest version of this story is that the currency is priced about right. Roodt goes further and argues for repealing expropriation without compensation and BEE on growth grounds, which is a contested political position worth separating from the arithmetic that precedes it.
The practical read for anyone pricing exports or importing stock: stop treating R9 as a rand someone stole from you. Build the model on R16, hedge the volatility that earned the currency its nickname, and treat the PPP gap as a description of cheap local input costs rather than a forecast.
You might also like our case for small business reform in South Africa, our piece on digital stokvel tech, and the latest SA startup news.
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