1. A method of managing trading, comprising: in a market for a particular type of instrument, receiving trading orders from a plurality of traders, each trading order having an associated price; placing each of the received trading orders on a trading exchange such that the trading orders may be executed; determining whether the price of a particular trading order differs from at least one comparison price by more than a threshold value; receiving from a particular trader a subsequent trading order having an original price that would trade with the price of the particular trading order; and if it is determined that the price of the particular trading order differs from the at least one comparison price by more than the threshold value: communicating an alert message regarding the subsequent trading order to the particular trader in response to receiving the subsequent trading order having an original price that would trade with the price of the particular trading order; and preventing the subsequent trading order from trading with the particular trading order at least until a response to the alert message is received from the particular trader.