Emerging Markets Weekly
The long term potential for real currency appreciation in the emerging markets is often discussed but little understood. It is based on established economic theory (Balassa-Samuelson effect) that suggests currencies will reflect differences in productivity levels in the tradable goods sector between developed and emerging markets and that rising productivity in emerging markets means wages and prices will rise in the emerging markets over the long term.If you ever noticed that prices are lower for non-tradable goods and services in emerging markets, haircuts for example, but tradable goods necessarily must reflect global market prices. Since productivity is lower in emerging markets, wages are lower too. The difference in prices at the current exchange rate represents the level of undervaluation of a given currency and the potential for real exchange rate convergence between emerging and developed markets over the long term, toward purchasing power parity (PPP). China’s currency is 50% undervalued based on PPP estimates according to a recent study, for example.
As productivity rises in tradable goods sectors in the emerging markets, incomes rise and prices of services such as haircuts are bid up too, even though productivity does not rise for these services (a haircut is a haircut). Eventually the price of these services rise relative to the price of tradable goods implying that real currency undervaluation will disappear over the long term.
Therefore, as incomes rise in the emerging markets over the long term and converge toward developed market levels, exchange rates are expected to converge toward PPP levels.
The Economist newspaper published an annual Big Mac Index that considers currency under/overvaluation based on PPP using the price of a Big Mac as the yardstick of measurement. This rough and ready measure suggests that the Chinese RMB and Russian ruble are roughly 50% undervalued based on PPP.







