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Bimetallism

Monetary standard in which the value of currency is based on quantities of two metals

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Through Exchange rate, Gold and Mint (facility)

For scholarly purposes, "proper" bimetallism is sometimes distinguished as permitting that both gold and silver money are legal tender in unlimited amounts and that gold and silver may be taken to be coined by the government mints in unlimited quantities. This distinguishes it from "limping standard" bimetallism, where both gold and silver are legal tender but only one is freely coined (e.g. the monies of France, Germany, and the United States after 1873), and from "trade" bimetallism, where both metals are freely coined but only one is legal tender and the other is used as "trade money" (e.g. most monies in western Europe from the 13th to 18th centuries). Economists also distinguish legal bimetallism, where the law guarantees these conditions, and de facto bimetallism, where gold and silver coins circulate at a fixed rate.

During the 19th century there was a great deal of scholarly debate and political controversy regarding the use of bimetallism in place of a gold standard or silver standard (monometallism). Bimetallism was intended to increase the supply of money, stabilize prices, and facilitate setting exchange rates. Some scholars argued that bimetallism was inherently unstable owing to Gresham's law, and that its replacement by a monometallic standard was inevitable. Other scholars claimed that in practice bimetallism had a stabilizing effect on economies. The controversy became largely moot after technological progress and the South African and Klondike Gold Rushes increased the supply of gold in circulation at the end of the century, ending most of the political pressure for greater use of silver. It became completely academic after the 1971 Nixon shock; since then, all of the world's currencies have operated as more or less freely floating fiat money, unconnected to the value of silver or gold. Nonetheless, academics continue to debate, inconclusively, the relative use of the metallic standards.

Historical creation

From the 7th century BCE, Asia Minor, especially in the areas of Lydia and Ionia, is known to have created a coinage based on electrum, a naturally occurring material that is a variable mix of gold and silver (with about 54% gold and 44% silver). Before Croesus, his father Alyattes had already started to mint various types of non-standardized electrum coins. They were in use in Lydia and surrounding areas for about 80 years. The unpredictability of its composition implied that it had a variable value which was very hard to determine, which greatly hampered its development.

Croeseids

Croesus (reigned c. 560–c. 546 BCE), king of Lydia, became associated with great wealth. Croesus is credited with issuing the Croeseid, the first true gold coins with a standardised purity for general circulation,

Herodotus mentioned the innovation made by the Lydians:

"So far as we have any knowledge, they [the Lydians] were the first people to introduce the use of gold and silver coins, and the first who sold goods by retail"

— Herodotus, I94

Achaemenid coinage

Many ancient bimetallic systems would follow, starting with Achaemenid coinage. From around 515 BCE under Darius I, the minting of Croesids in Sardis was replaced by the minting of Darics and Sigloi. The earliest gold coin of the Achaemenid Empire, the Daric, followed the weight standard of the Croeseid, and is therefore considered to be later and derived from the Croeseid. The weight of the Daric would then be modified through a metrological reform, probably under Darius I.

Sardis remained the central mint for the Persian Darics and Sigloi of Achaemenid coinage, and there is no evidence of other mints for the new Achaemenid coins during the whole time of the Achaemenid Empire. Although the gold Daric became an international currency which was found throughout the Ancient world, the circulation of the Sigloi remained very much limited to Asia Minor: important hoards of Sigloi are only found in these areas, and finds of Sigloi beyond are always very limited and marginal compared to Greek coins, even in Achaemenid territories.

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