par of exchange

par of exchange　汇兑平价，外汇平价，外汇牌价　

The established value of the coin or standard of value of one country when expressed in the coin or standard of another，as the value of the pound sterling in the currency of France or the United States.The par of exchange rarely varies，and serves as a measure for the rise and fall of exchange that is affected by the demand and supply.Exchange is at par when，for example，a bill in New York，for the payment of one hundred pounds sterling in London，can be purchased for the sum.Exchange is in favor of a place when it can be purchased there at or above par.