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Base Currency

The base currency is the first currency in a currency pair. The second currency is named the quote currency (counter currency, terms currency). Exchange rates are quoted in per unit of the base currency. Note that FX market convention is the reverse of mathematical convention.

Currently the euro has first precedence for base currency; as a result, all currency pairs involving it should have the euro as the first currency. For example, between the US dollar and the euro the exchange rate will be identified as EUR/USD; the number is the amount of US dollars that can be traded for one euro.

The currency hierarchy for the majors is as follows: