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→Later Developments
While gold gained increased importance in places, particularly as international trade developed more formally in the 3rd and 2nd millennium BCE across the Mediterranean and Central Asia, from there the worth of gold did stall for a period. The next period of expansion likely occurred when coinage was developed. Sometime by the early 6th century BCE, silver and gold were now used to create coins. As coins were intended to symbolize value, it was important now that gold had to be pure. In fact, electrum, which combined silver and gold, was outlawed in Lydia, which has been considered the first state to use coinage. The use of coinage was initially in international trade. As empires developed across the Mediterranean in the mid to late 1st millennium BCE, that now connected the Mediterranean basin with Central Asia and India, coinage became more important for trade. The rise of the Achaemenid and particularly Greek-based empires in Bactria and Seleucia helped spread coinage to many regions. Gold now became the key material that was used for the most valued exchanges across much of the Old World. Expanding Greek colonies in Europe, increased trade across Central Asia, which became the Silk Road, and seaborne trade via India and the Arabian Sea became some of the most important trade routes in the Roman and late Classical period.
In effect, what emerged, as key international trade routes such as the Silk Road developed, was gold became of the key commodities that supported the value of trade items such as silk, metals, spices, and other substances traded. The Roman's, with their important trade role, spread the use of silver and gold coins to different areas of their empire in Europe. After the collapse of the Roman Empire, the minting of coins had halted in many regions, particularly northern Europe(Figure 2). However, the Byzantine Empire continued to mint gold coins and the <i>bezant</i> became a standard used by that Empire. The Byzantine Empire dominated Mediterranean trade and southern European trade in the early Medieval period, leading to the gold standard becoming paramount. Gold continued to be used along the Silk Road and related trade routes.
In Europe, developing kingdoms, such as those developed by the Anglo-Saxons and Franks, began to use silver rather than gold. Silver, thus, became the main standard over gold in Europe. It was only under the reign of Queen Anne in the early 18th century, and particularly after the Napoleonic Wars, that gold began to become important again in the role it played in the economy. The British specie began to be the standard that was used in the 18th and 19th centuries, where laws in the early 19th century helped to solidify its role. As Britain's trade empire increased, along with its trade influence, the gold standard, once again, began to spread across the globe, similar to how it did during the Classical period.
Major disruptions occurred in World War I, when the British specie became in short supply and there was increased distruption to international trade during the conflict. The gold coin standard was, thus, changed to gold bullion after the war in Britain. Fluctuations and disruptions occurred due to the Great Depression and World War II; however, gold continues to play a key role in major Western and other economies today.
[[File:Nerva Aureus Concordia.png|thumbnail|Figure 2. Gold coin from the 1st century CE from the Roman Empire.]]
==Deep Impact of Gold==
