By the standard measure of purchasing-power parity, which reflects currencies' relative buying power, all of South-East Asia's currencies are now undervalued.
On the OECD's calculations of purchasing-power parity (a measure that adjusts for relative prices), the franc is 42% overvalued against the euro and 44% against the dollar.
The Big Mac Index uses PurchasingPowerParity (PPP) in comparing the price of the ubiquitous Big Mac across countries relative to its price in the USA. PPP refers to the idea that exchange rates across two countries should be equal to the relative price of a basket of goods and services in both countries.