For example, if you invested 5,000 EUR and lost 1,000 EUR, you will have lost 20% of your balance, leaving you with a final balance of 4,000 EUR. To bring your balance back to 5,000 EUR, you will need to make a profit of 1,000 EUR. However, with a starting balance of 4,000 EUR (after the previous loss), there is now a 25% gain, rather than a 20% one.
Forex is a portmanteau of foreign currency and exchange. Foreign exchange is the process of changing one currency into another currency for a variety of reasons, usually for commerce, trading, or tourism. According to a recent triennial report from the Bank for International Settlements (a global bank for national central banks), the average was more than $5.1 trillion in daily forex trading volume.