How is the closing price determined in a closing auction?

How is the closing price determined in a closing auction?

• A. Last traded price
• B. Midpoint of best bid and offer
• C. Price of highest executable volume
• D. Average price of executed trades

Answer: (C)

In a closing auction, the price is set to maximize the number of shares that can be traded at a single clearing price. The system gathers all bids and offers and finds the price at which the executable volume is largest, effectively clearing the closing book as much as possible. This makes the closing price the best representation of supply and demand at the moment the market closes. It's not the last traded price from continuous trading, because the closing price comes from the auction mechanism, which may produce a different value to maximize volume. It's not the midpoint of the best bid and offer, which is just a theoretical halfway point and not necessarily the price that clears the auction. It's not the average of executed trades, since the closing auction aims for one clear price that maximizes volume rather than averaging multiple trades.

In a closing auction, the price is set to maximize the number of shares that can be traded at a single clearing price. The system gathers all bids and offers and finds the price at which the executable volume is largest, effectively clearing the closing book as much as possible. This makes the closing price the best representation of supply and demand at the moment the market closes.

It's not the last traded price from continuous trading, because the closing price comes from the auction mechanism, which may produce a different value to maximize volume. It's not the midpoint of the best bid and offer, which is just a theoretical halfway point and not necessarily the price that clears the auction. It's not the average of executed trades, since the closing auction aims for one clear price that maximizes volume rather than averaging multiple trades.