When trading Forex, you'll see that both 'Bid' and 'Ask' prices are quoted. The bid price is the price at which you can buy the currency, while the ask price is the price at which you can sell it. On the off chance that you are buying a currency in an exchange, this is known as a long exchange, and the expectation is that the currency pair will increase in esteem, so you can sell it at a more significant expense and have a benefit on the effect. In the event that you are selling a currency in an exchange, the inverse is valid - the expectation is that the currency pair will fall in esteem, so you can buy it back at a lower price, which implies you will benefit on the difference.