Spread is the difference between Bid and Ask prices. In turn, Floating Spread is a constantly changing value between Ask and Bid prices. It accurately reflects the prices of trading instruments and how quickly they are changing. Floating Spread you pay for purchasing a currency pair fluctuates because of things like supply, demand and total trading activity. When placing a trade on the market, the spread is also the main cost of the position. The tighter the spread, the lower the cost of trading. The wider the spread, the more it costs.