There are three figures to consider when it comes to CFD trading - 'Bid', 'Ask' and 'Spread'. 'Bid' (sell) is the sell price which is generally displayed on the left while the 'Ask' (buy) price is the higher of the two and the rate at which you buy the asset. The difference between these two prices is the 'spread' and is the cost of trading. Depending on the liquidity of your asset, the spread can be tight or wide.