Which factor most directly affects the size of the bid-ask spread?

Which factor most directly affects the size of the bid-ask spread?

• A. Liquidity
• B. Issuer credit rating
• C. Market capitalization
• D. Dividend yield

Answer: (A)

Liquidity directly drives the width of the bid-ask spread. When a market has lots of participants and high trading volume, there are many buyers and sellers competing for orders, so dealers and market makers can quote prices that are very close together. The cost of executing a trade is low, and the spread shrinks as a result. In markets with low liquidity, there are fewer resting orders and greater uncertainty for the broker or market maker about how quickly they can offset risk if the price moves. To compensate for that risk and the higher inventory carrying costs, they widen the quotes, making the bid-ask spread larger. Issuer credit rating, market capitalization, and dividend yield influence other aspects of value or risk perception, but they do not directly determine how tight or wide the current quotes are. They can affect demand and overall price, which may indirectly impact liquidity over time, but the immediate factor setting the size of the spread is how readily a security can be traded now — its liquidity.

Liquidity directly drives the width of the bid-ask spread. When a market has lots of participants and high trading volume, there are many buyers and sellers competing for orders, so dealers and market makers can quote prices that are very close together. The cost of executing a trade is low, and the spread shrinks as a result. In markets with low liquidity, there are fewer resting orders and greater uncertainty for the broker or market maker about how quickly they can offset risk if the price moves. To compensate for that risk and the higher inventory carrying costs, they widen the quotes, making the bid-ask spread larger.

Issuer credit rating, market capitalization, and dividend yield influence other aspects of value or risk perception, but they do not directly determine how tight or wide the current quotes are. They can affect demand and overall price, which may indirectly impact liquidity over time, but the immediate factor setting the size of the spread is how readily a security can be traded now — its liquidity.