In Forex trading it is understood as a speculative attempt to make a quick profit by entering and exiting trades in a very short period of time and very frequently. Trades can last from seconds to minutes. Hence, a scalper is a trader who trades for small, short-term profits.
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As with other financial instruments, there is a price an investor can sell at which is called "bid" price.
Thanks to the advancement of technology, you no longer need to be a full-time forex broker or floor trader to have access to the markets.