buying on margin

Trade involves the transfer of goods and services from one person or entity to another, often in exchange for money. Economists refer to a system or network that allows trade as a market.

An early form of trade, barter, saw the direct exchange of goods and services for other goods and services, i.e. trading things without the use of money. Modern traders generally negotiate through a medium of exchange, such as money. As a result, buying can be separated from selling, or earning. The invention of money (and letter of credit, paper money, and non-physical money) greatly simplified and promoted trade. Trade between two traders is called bilateral trade, while trade involving more than two traders is called multilateral trade.

In one modern view, trade exists due to specialization and the division of labour, a predominant form of economic activity in which individuals and groups concentrate on a small aspect of production, but use their output in trades for other products and needs. Trade exists between regions because different regions may have a comparative advantage (perceived or real) in the production of some trade-able commodity—including production of natural resources scarce or limited elsewhere. For example: different regions' sizes may encourage mass production. In such circumstances, trade at market prices between locations can benefit both locations. Different types of traders may specialize in trading different kinds of goods; for example, the spice trade and grain trade have both historically been important in the development of a global, international economy.

Retail trade consists of the sale of goods or merchandise from a very fixed location (such as a department store, boutique or kiosk), online or by mail, in small or individual lots for direct consumption or use by the purchaser. Wholesale trade is traffic in goods that are sold as merchandise to retailers, or to industrial, commercial, institutional, or other professional business users, or to other wholesalers and related subordinated services.

Historically, openness to free trade substantially increased in some areas from 1815 to the outbreak of World War I in 1914. Trade openness increased again during the 1920s but collapsed (in particular in Europe and North America) during the Great Depression of the 1930s. Trade openness increased substantially again from the 1950s onwards (albeit with a slowdown during the oil crisis of the 1970s). Economists and economic historians contend that current levels of trade openness are the highest they have ever been.

Etymology

''Trade'' is from Middle English ''trade'' ("path, course of conduct"), introduced into English by Hanseatic merchants, from Middle Low German ''trade'' ("track, course"), from Old Saxon ''trada'' ("spoor, track"), from Proto-Germanic ''*tradō'' ("track, way"), and cognate with Old English ''tredan'' ("to tread").

''Commerce'' is derived from the Latin ''commercium'', from ''cum'' "together" and ''merx'', "merchandise."

History

Prehistory

Trade originated from human communication in prehistoric times. Trading was the main facility of prehistoric people, who exchanged goods and services from each other in a gift economy before the innovation of modern-day currency. Peter Watson dates the history of long-distance commerce from years ago. Watson (2005), Introduction.

In the Mediterranean region, the earliest contact between cultures involved members of the species ''Homo sapiens'', principally using the Danube river, at a time beginning 35,000–30,000 BP.

Some trace the origins of commerce to the very start of transactions in prehistoric times. Apart from traditional self-sufficiency, trading became a principal facility of prehistoric people, who bartered what they had for goods and services from each other.

Ancient history

Trade is believed to have taken place throughout much of recorded human history. There is evidence of the exchange of obsidian and flint during the Stone Age. Trade in obsidian is believed to have taken place in New Guinea from 17,000 BCE.

Robert Carr Bosanquet investigated trade in the Stone Age by excavations in 1901. Trade is believed to have first begun in south west Asia.

Archaeological evidence of obsidian use provides data on how this material was increasingly the preferred choice rather than chert from the late Mesolithic to Neolithic, requiring exchange as deposits of obsidian are rare in the Mediterranean region.

Obsidian is thought to have provided the material to make cutting utensils or tools, although since other more easily obtainable materials were available, use was found exclusive to the higher status of the tribe using "the rich man's flint". Interestingly, Obsidian has held its value relative to flint.

Early traders traded Obsidian at distances of 900 kilometres within the Mediterranean region.

Trade in the Mediterranean during the Neolithic of Europe was greatest in this material. Networks were in existence at around 12,000 BCE Anatolia was the source primarily for trade with the Levant, Iran and Egypt according to Zarins study of 1990. Melos and Lipari sources produced among the most widespread trading in the Mediterranean region as known to archaeology.

The Sari-i-Sang mine in the mountains of Afghanistan was the largest source for trade of lapis lazuli. The material was most largely traded during the Kassite period of Babylonia beginning 1595 BCE.

Later trade

Mediterranean and Near East

Ebla was a prominent trading center during the third millennia BCE, with a network reaching into Anatolia and north Mesopotamia.

Materials used for creating jewelry were traded with Egypt since 3000 BCE. Long-range trade routes first appeared in the 3rd millennium BCE, when Sumerians in Mesopotamia traded with the Harappan civilization of the Indus Valley. The Phoenicians were noted sea traders, traveling across the Mediterranean Sea, and as far north as Britain for sources of tin to manufacture bronze. For this purpose they established trade colonies the Greeks called emporia. Along the coast of the Mediterranean, researchers have found a positive relationship between how well-connected a coastal location was and the local prevalence of archaeological sites from the Iron Age. This suggests that a location's trade potential was an important determinant of human settlements.

From the beginning of Greek civilization until the fall of the Roman Empire in the 5th century, a financially lucrative trade brought valuable spice to Europe from the far east, including India and China. Roman commerce allowed its empire to flourish and endure. The latter Roman Republic and the Pax Romana of the Roman empire produced a stable and secure transportation network that enabled the shipment of trade goods without fear of significant piracy, as Rome had become the sole effective sea power in the Mediterranean with the conquest of Egypt and the near east.

In ancient Greece Hermes was the god of trade (commerce) and weights and measures. In ancient Rome, ''Mercurius'' was the god of merchants, whose festival was celebrated by traders on the 25th day of the fifth month. The concept of free trade was an antithesis to the will and economic direction of the sovereigns of the ancient Greek states. Free trade between states was stifled by the need for strict internal controls (via taxation) to maintain security within the treasury of the sovereign, which nevertheless enabled the maintenance of a ''modicum

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