A key component to understanding the example mentioned is the concept of BID and ASK. The BID is the price that buyers are willing to pay whereas the ASK is the price that a seller is currently offering. So with GBP/USD the price is displayed in the form (BID/ASK). As such, when a trader wants to open a BUY position also referred to as “going long” the trader will pay the ASK price displayed. And conversely if a trader wishes open a SELL position also referred to as “selling short” then the seller will receive the BID price. Summarized. A long position (BUY) taken in GBP/USD with a current market rate of 1.3002/1.3006 will be acquired using the ASK price of 1.3006 and a short position (SELL) taken in GBP/USD with the same market price will be sold at a price of 1.3002.