How do I know which currency will go up or down?

Currencies are subject to the laws of supply and demand, just like any other commodity. When more people want a particular currency, the cost of the currency in terms of other currencies will rise. When demand decreases or people do not want to hold a country’s currency, the value will go down.

International currency prices are highly volatile and very difficult to predict. Due to such volatility, no system can assure you that transactions on the foreign currency market should result in great benefits for you, nor is it possible to guarantee that your transactions will yield favorable results.