Three tiers of coins system had been used in ancient India since the time of the Mahajanapadas. In Europe, this system worked through the medieval period because there was virtually no new gold, silver or copper introduced through mining or conquest. Thus the overall ratios of the three coinages remained roughly equivalent.

One of main feature of Forex market is standard instruments for controlling risk exposure.

The bid/ask spread is minimal for actively traded pairs of currencies, usually 0–3 pips. For example, the bid/ask quote of EUR/USD might be 1.4200/1.4203. Minimum trading size for most deals is usually $100,000.