The spread is the difference between the bid price and the ask price of a financial instrument. It represents one of the most important transaction cost components in trading and directly affects profitability. A tight spread indicates high liquidity and low trading costs, while a wide spread suggests lower liquidity or increased volatility. In forex trading, spreads are usually measured in pips and vary depending on the currency pair, time of day, market conditions, and broker model. ECN brokers typically offer variable spreads based on market conditions, while market makers often provide fixed or slightly variable spreads. For scalpers and high-frequency traders, a tight spread is particularly important, as cumulative costs over many trades can become significant.
