The foreign exchange (currency or forex or FX) market exists wherever one currency is traded for another. It is by far the largest financial market in the world, and includes trading between large banks, central banks, currency speculators, multinational corporations, governments, and other financial markets and institutions. The average daily trade in the global forex and related markets currently is over US$ 3 trillion.[1] Retail traders (individuals) are a small fraction of this market and may only participate indirectly through brokers or banks, and are subject to forex scams.
[edit] Type of speculators
Most non-professional traders lose money on speculation, while those who do make money tend to become professionals. Occasionally some dramatic event will occur, such as the effort of the Hunt brothers to corner the silver market or the currency speculations of George Soros or the speculative trading of Nick Leeson, which caused the collapse of Barings Bank.
By some definitions, most long-term investors, even those who buy and hold for decades, may be classified as speculators,[citation needed] excepting only the rare few who are not primarily motivated by eventually selling at a good profit. Some dedicated speculators are distinguished by shorter holding times, the use of leverage, by being willing to take short positions as well as long positions (in markets where the distinction can be reasonably made). A degree of speculation exists in a wide range of financial decisions, from the purchase of a house to a bet on a horse; this is what modern market economists call "ubiquitous speculation."
In Security Analysis, Benjamin Graham gave a definition of speculation in relation to investment: "An investment operation is one which, upon thorough analysis, promises safety of principal and a satisfactory return. Operations not meeting these requirements are speculative."

[edit] The economic benefits of speculation
The service provided by speculators to a market is primarily that by risking their own capital in the hope of profit, they add liquidity to the market and make it easier for others to offset risk, including those who may be classified as hedgers and arbitrageurs.
If a certain market - for example, pork bellies - had no speculators, then only producers (pig farmers) and consumers (butchers, etc.) would participate in that market. With fewer players in the market, there would be a larger spread between the current bid and ask price of pork bellies. Any new entrant in the market who wants to either buy or sell pork bellies will be forced to accept an illiquid market and market prices that have a large bid-ask spread or might even find it difficult to find a co-party to buy or sell to. A speculator (e.g. a pork dealer) may exploit the difference in the spread and, in competition with other speculators, reduce the spread, thus creating a more efficient market.
Another example of the value of speculators is the ability of a pig farmer to sell his pork on a futures exchange at a known price ahead of its production.

[edit] Some side effects
Auctions are a method of squeezing out speculators from a transaction, but they have their own perverse effects; see winner's curse. The winner's curse is however not very significant to markets with high liquidity for both buyers and sellers, as the auction for selling the product and the auction for buying the product occur simultaneously, and the two prices are separated only by a relatively small spread. This mechanism prevents the winner's curse phenomenon from causing mispricing to any degree greater than the spread.
Speculative purchasing can also create inflationary pressure, causing particular prices to increase above their "true value" (real value - adjusted for inflation) simply because the speculative purchasing artificially increases the demand. Speculative selling can also have the opposite effect, causing prices to artificially decrease below their "true value" in a similar fashion. In various situations, price rises due to speculative purchasing cause further speculative purchasing in the hope that the price will continue to rise. This creates a positive feedback loop in which prices rise dramatically above the underlying "value" or "worth" of the items. This is known as an economic bubble. Such a period of increasing speculative purchasing is typically followed by one of speculative selling in which the price falls significantly, in extreme cases this may lead to crashes. Overall, the participation of speculators in financial markets tends to be accompanied by significant increase in short-term market volatility. This is not necessarily a bad thing, as heightened level of volatility implies that the market will be able to correct perceived mispricings more rapidly and in a more drastic manner.

[edit] Etymology
The word "speculate" comes from the Latin word speculatus, which is the past participle of speculari , meaning to look ahead, to spy, and to examine. The word speculari derives from the name specula, from specere "to see", who was the Roman legionary that watch the legion's camp known as castrum. In this word we find the etymological significant of the contemporanean word, that implies the activity of looking at distant things, in the space and also in the time. From "specula" derive in late Latin the word "speculatio, speculationis", the activity of philosophical enquiring. The word is used now with this sense in philosophy, as the activity of theorizing without a solid factual base, as the modern financial speculator who take position in the market without a solid statistical base.

[edit] Books
Sobel, Robert [1973] (2000). The Money Manias: The Eras of Great Speculation in America, 1770-1970. Beard Books. ISBN 1-58798-028-2.
Gunther, Max (1992). The Zurich Axioms. Souvenir Press. ISBN 0-285-63095-4.
Niederhoffer, Victor (2005). Practical Speculation. Wiley. ISBN 0-471-67774-4.

[edit] See also

Wikiquote has a collection of quotations related to:
Speculation

Look up speculation in Wiktionary, the free dictionary.
Behavioral finance
Equity investment
Fictitious capital
Financial markets
Day trading
Jesse Lauriston Livermore
Gambling
Seasonal traders
Short selling
Speculative Attack
Stock market bubble
Stock trader
Tobin tax
Tulip mania
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