For a good account see the article How does China Manipulate its Currency? which can be found at:
http://www.onemint.com/2009/01/26/how-does-china-manipulate-its-currency/comment-page-1/
Basically the article summarizes a couple of key strategies for setting currencly value:
Buying Dollars to Keep the Dollar Price HighIndirect Measures (like putting a cap on the amount of foreign assets that locals can invest abroad or allowing tax free repatriation of the Great Britain Pound, for example, whereby the British government can help boost inflow of Pounds in the country, and influence the exchange rate)20 countries has highest value for it's currency
Vietnamese Dong
A Currency Devaluation
Currency stability is when money is worth a set amount over a period of time. There is not a fluctuation in the value of currency.
A fixed currency is used in countries where the value of the money is closely tied to the value of gold, or the value of another country's currency. A floating currency is one that changes depending on the state of the market, i. e. supply and demand.
20 countries has highest value for it's currency
Because the value of each currency is based on their economic strength. Currency is traded between countries - and one currency may be in more demand (increasing its value) than another.
Vietnamese Dong
A Currency Devaluation
How a currency value will be displayed depends upon which currency it is set to display, so it could display as €1,000.50, $1,000.50, £1,000.50, etc. It could even display as €1.000,50 in countries, such as Spain, where the thousands separator is a full stop (period).
Currency stability is when money is worth a set amount over a period of time. There is not a fluctuation in the value of currency.
A fixed currency is used in countries where the value of the money is closely tied to the value of gold, or the value of another country's currency. A floating currency is one that changes depending on the state of the market, i. e. supply and demand.
Countries have their own Currency as a lot of them were made to only be used in their country of origin. Currencies like the US Dollar are widely accepted in countries outside the US due to its value over the countries own currency.
Many countries use dollar as their currency unit and they are not of the same value. Also, many countries use dinar as their currency unit and they are not of the same value. The question needs to be more specific.
The beginner level:Exchange rates are set by market forces. The currency is "traded" in a global market place.Its value is set by how badly people want a certain currencyThis can be effected by interest rates in each country, government and personal debt levels in each countryAnd of course whether other countries and business will accept the currency for payment of debt.Finally there are Currencies that are pegged or locked to the value of gold or another currency by that countries law. This brings in a black market exchange of this currency that can make gangsters good money.Please see: How do exchange rates work?Thanks.
There a few countries that use "pesos" but they're all of different value.
People like having a currency whose value is dependable and stable.