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Shell money is a medium of trade similar to coin money and other forms of commodity money, and was once commonly used in many parts of the world. Shell money usually consisted of whole or partial sea shells, often worked into or otherwise shaped. The use of shells in trade began as direct commodity exchange, the shells having use-value as Jewellery. The distinction between as commodities and beads as money has been the subject of debate among economic anthropologists.Davies 1994, Mauss 1950, Trubitt 2003
Shell money has appeared in the Americas, Asia, Africa and Australia. The shell most widely used worldwide as currency was the shell of Cypraea moneta, the money cowry. This species is most abundant in the Indian Ocean, and was collected in the Maldive Islands, in Sri Lanka, along the Malabar coast, in Borneo and on other East Indian islands, and in various parts of the coast from Ras Hafun to Mozambique. Cowry shell money was an important part of the trade networks of Africa, South Asia, and East Asia.
The shell most valued by the Native American tribes of the Pacific Coast from Alaska to northwest California was Dentalium shell, one of several species of tusk shell or scaphopod. The tusk shell is naturally open at both ends, and can easily be strung on a thread. This shell money was valued by its length rather than the exact number of shells; the "ligua", the highest denomination in their currency, was a length of about 6 inches.
Farther south, in central California and southern California, the shell of the olive snail Olivella biplicata was used to make beads for at least 9,000 years. The small numbers recovered in older archaeological site components suggest that they were initially used as ornamentation, rather than as money.Hughes and Milliken 2007 Beginning shortly before 1,000 years ago, Chumash people specialists on the islands of California's Santa Barbara Channel began chipping beads from olive shells in such quantities that they left meter-deep piles of manufacturing residue in their wake; the resulting circular beads were used as money throughout the area that is now southern California.Arnold and Graesch 2001 Starting at about AD 1500, and continuing into the late nineteenth century, the Coast Miwok, Ohlone, Patwin, Pomo, and Wappo peoples of central California used the marine bivalve Saxidomus sp. to make shell money.Chagnon 1970; Milliken et al. 2007:117; Vayda 1967.
In West Africa the cowrie shell was widely used, including regions far from the coast. By the early 16th century European traders were importing thousands of pounds of cowries to trade for cloth, food, wax, hides, and other goods as well as slaves. These currency flows were instrumental in the development of the powerful states of Benin, Ouidah and others along the coast.- Between 1500 and 1875 at least 30 billion cowries were imported to the Bight of Benin, accounting for 44% of the total value of trade. Around 1850 the German explorer Heinrich Barth found it fairly widespread in Kano, Kuka, Gando, and even Timbuktu. Barth relates that in Muniyoma, one of the ancient divisions of Bornu, the king's revenue was estimated at 30,000,000 shells, with every adult male being required to pay annually 1,000 shells for himself, 1,000 for every pack-ox, and 2,000 for every slavery in his possession.
The shells were fastened together in strings of forty or one-hundred each, so that fifty or twenty strings represented a dollar.
As the value of the cowrie and the nzimbu was much greater in Africa than in the regions from which European traders obtained their supply, the trade was extremely lucrative. In some cases the gains are said to have been 500%. As these currency imports increased, however, inflation took hold and damaged the local economies.
In parts of British West Africa, cowries remained accepted for tax payments until the early 20th centuries, and their use as currency in unregulated environments persisted until the 1960s. The national currency of Ghana introduced in 1965, the Ghanaian cedi, was named after cowrie shells.
Cowries or kaudi were used as means of exchange in India since ancient times up to around 1830. In Bengal, where they were exchanged at a rate of 2560 to a rupee, In details- 4 cowries equaled 1 ganda, 5 gandas equaled 1 budis, 4 budis equaled 1 pana, 16 panas equaled 1 kahan, and 10 kahanas equaled 1 tanka/rupee.
The annual importation in early 19th century Bengal from the Maldives was valued at about 30,000 rupees. A single slave would sell for 25,000 cowries.
In Orissa, India, the use of the kaudi was abolished by the British East India Company in 1805 in favor of silver. This was one of the causes of the Paik Rebellion in 1817.
In Southeast Asia, when the value of the Siamese tical (Thai baht) was about half a troy ounce of silver (about 16 grams), the value of the cowrie ( bia) was fixed at baht.
In the islands north of New Guinea the shells were broken into flakes. Holes were bored through these flakes, which were then valued by the length of a threaded set on a string, as measured using the finger joints. Two shells are used by these Pacific islanders, one a cowry found on the New Guinea coast, and the other the common pearl shell, broken into flakes.
In the South Pacific Islands the species Oliva carneola was commonly used to create shell money. As late as 1882, local trade in the Solomon Islands was carried on by means of a coinage of shell beads, small shells laboriously ground down to the required size by the women. No more than were actually needed were made, and as the process was difficult, the value of the coinage was satisfactorily maintained.
Although rapidly being replaced by modern coinage, the cowry shell currency is still in use to some extent in the Solomon Islands. The shells are worked into strips of decorated cloth whose value reflects the time spent creating them.
On the Papua New Guinea island of East New Britain, shell currency is still used and can be exchanged for the Papua New Guinean kina.
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