For example, the purchasing power of the US dollar relative to that of the euro is the dollar price of a euro (dollars per euro) times the euro price of one unit of the market basket (euros/goods unit) divided by the dollar price of the market basket (dollars per goods unit), and hence is dimensionless.
In order to determine which is the fixed currency when neither currency is on the above list (i.e.
There are some exceptions to this rule: for example, the Japanese often quote their currency as the base to other currencies.
The real exchange rate (RER) is the purchasing power of a currency relative to another at current exchange rates and prices.
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