      The Exchange defines an MOC order as "a market order which is to beexecuted in its entirety at the closing price on the Exchange of the stocknamed in the order, and if not so executed, is to be treated as canceled."When there is an imbalance of MOC orders, the stock that represents theimbalance is executed against the prevailing bid or offer on the Exchangeat the close of trading and sets the closing price. This means that anexcess of MOC buy orders are executed against the offer, and an excess ofMOC sell orders are executed against the bid. The remaining buy and sellMOC orders are then paired off at the price at which the imbalance wasexecuted. When the total size of the MOC buy orders equals the total sizeof the MOC sell orders, the buy and sell orders are paired off at the priceof the previous NYSE trade. The result of these pricing procedures is thatall executed MOC orders receive the same closing price. Executable limitorders in the Book may be left unfilled because the paired MOC orders arecrossed rather than executed against the orders in the Book.