      A trader's order submission strategy depends on the trading problemthat he faces; therefore, evaluation of order execution performance musttake this into account. For example, a trader who needs to quicklyliquidate a position may be willing to pay for immediacy. This trader, whois pre-committed to trading, will probably choose to use a market order totrade. On the other hand, a trader who is only interested in making aprofitable round trip (Day Trading) and who has no fundamental reason toestablish a position, will not pay for liquidity. Instead, this trader islikely to offer limit orders and hope that other traders who do demandimmediacy will take his offer. He is a passive trader in the sense that hewill only trade if someone else initiates.