Some facts about FOREX
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The Composite Index of Leading Indicators is made up of 10 economic components, whose changes tend to precede changes in the overall economy.
A currency is a unit of exchange, facilitating the transfer of goods and services. It is one form of money, where money is anything that serves as a medium of exchange, a store of value, and a standard of value.
At various times countries have either re-stamped foreign coins, or used currency board issuing one note of currency for each note of a foreign government held, as Ecuador currently does.