What are spreads in trading, and how do they work?

Spreads represent the difference between the bid and ask price of an asset, and they reflect market liquidity and trading conditions. The bid price is the highest price a buyer is willing to pay, while the ask price is the lowest price a seller is willing to accept. The gap between these two prices, i.e., the spread, effectively represents the cost of entering a trade, as every position starts at a slight disadvantage equal to the spread amount that must be recovered before the trade becomes profitable.

Spreads are not fixed. They fluctuate continuously based on market conditions. During periods of high liquidity, such as peak trading hours when major financial centres are active, spreads tend to be tighter because a large number of buyers and sellers are competing to fill orders at competitive prices. Conversely, during off-peak hours, around major news events, or in less liquid instruments, spreads tend to widen as fewer participants are available and uncertainty increases. Understanding these patterns helps traders choose the most cost-effective moments to enter and exit positions.

For active traders, paying close attention to spreads is an important part of managing overall trading costs. Even small differences in spread width can add up significantly over time, especially for those who execute a high volume of trades. Major currency pairs and popular indices typically offer the tightest spreads due to their strong liquidity, while exotic pairs, smaller stocks, or niche instruments generally carry wider spreads. Comparing spread conditions across instruments and timing trades to coincide with periods of optimal liquidity are practical steps that help traders reduce unnecessary costs and improve their overall trading efficiency.