Currencies
A currency is a system of money (monetary units) in common use. Standardization (like Reuters) facilitates exchanges between currencies.
Example: 'EUR' is the standard code for the Euro. It might have a display code '€' or 'Eur'.
A currency has the following fields:
- Code
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The functional identifier of the currency
- Display Code
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The display code of the currency
- Description
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The description of the currency
- Default?
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Is this currency the default currency? (there should be one and only one default currency)