Countries that have immature， potentially unstable economies usually use a pegged system. Developing nations can use this system to prevent out-of-control inflation. The system can backfire， however， if the real world market value of the currency is not reflected by the pegged rate. In that case， a black market may spring up， where the currency will be traded at its market value， disregarding the governments peg.

　　When people realize that their currency isnt worth as much as the pegged rate indicates， they may rush to exchange their money for other， more stable currencies. This can lead to economic disaster， since the sudden flood of currency in world markets drives the exchange rate very low. So if a country doesnt take good care of their pegged rate， they may find themselves with worthless currency.

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