Legal tender
Legal tender is a money, that may be used to make payments against the will of one of the exchange partners.[1]
Exchange rate
Legal tender laws would merely complicate trading, but practically always specify a conversion ratio - a price - between the privileged money and other monies, different from the market price. This is done to benefit debtors (like the state).
For example, the law sets the ratio at 20 ounces of silver for one ounce of gold, but the market price is 15. A contract or debt for 20 ounces of silver can be now paid with 1 ounce of gold - which the debtor can buy for much less than was the original debt. As a result, no one will be willing to enter a contract quoted in silver.
This is called Gresham's Law: an overvalued money will drive undervalued money out of the market. Or put simply, "the bad money drives the good money out". People stop using the metal, that is in reality more valuable than according to the letter of the law. The metal will be held or sold into other countries.[1]
Bimetallism
Bimetallism is a currency system with forced exchange ratios between coins from different metals, often between gold and silver. In accord with the Gresham's Law, if a metal is undervalued, it will be driven out of circulation. This was notable, for example, in the British currency reform of 1717, or the US reforms of 1792 and 1834.[1]
References
- ↑ 1.0 1.1 1.2 Jörg Guido Hülsmann. "The Ethics of Money Production", online version, Chapter 10. Legal-Tender Laws p.125, referenced 2009-06-24.