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There are two ways to express an exchange rate between two currencies (e.g., between the U.S. dollar [$] and the British pound [£]). One can either write $/£ or £/$. These are reciprocals of each other. Thus if E is the $/£ exchange rate and V is the £/$ exchange rate, then E = 1/V.

The exporter in France and the importer in the US agree upon an exchange rate of 1.30 US dollars for 1 euro that will govern the transaction that is to take place six months from the date the currency forward contract is made between them.

For US dollars, the symbol '$' is sufficient abbreviation, unless there is a mixture of dollar currencies in the text. For other dollar currencies, '$' should be prefixed with the country abbreviation. For all other currencies, write the figure first followed by the currency name, for example, '100 million yuan'.

Summary. Currency value is determined by aggregate supply and demand. Supply and demand are influenced by a number of factors, including interest rates, inflation, capital flow, and money supply. The most common method to value currency is through exchange rates.

To strengthen the exchange rate, the central bank simply raises its policy interest rate. As investors in search of higher returns increase their demand for the currency, the exchange rate appreciates. By lowering interest rates, the central bank can weaken the exchange rate.

For US dollars, the symbol '$' is sufficient abbreviation, unless there is a mixture of dollar currencies in the text. For other dollar currencies, '$' should be prefixed with the country abbreviation. For all other currencies, write the figure first followed by the currency name, for example, '100 million yuan'.

If a contract between parties from different countries refers to a currency that uses the dollar sign, using a currency code or a suitably modified currency sign, such as A$ for Australian dollars and Mex$ for Mexican pesos, would make it clear which currency is being referred to.