1. A method of order management and execution for trading an exchange listed financial instrument for which a net asset value is periodically calculated, comprising: (a) receiving, with an order receipt computer, an order to trade an exchange listed financial instrument for which a net asset value is periodically calculated, said order authorizing at least one of a specified party and computerized algorithm to transmit the order for execution; (b) accessing, with a market selection computer, at least one conventional secondary market and at least one net asset value based secondary market; (c) evaluating, with the market selection computer, the at least one conventional secondary and the at least one net asset value based secondary market, and selecting at least one of the evaluated markets; (d) determining, with a market and order evaluation computer, whether to authorize the transmission of the order for execution in whole, in part, or not all; (e) selecting, with an order type selection computer, at least one order type from the order types authorized by said order and offered by a selected market; (f) authorizing, with an order entry computer, at least one entry of all of the order, entry of part of the order, and cancellation of all or part of the order; and (g) with an instruction computer, at least one of: receiving or delivering instructions for trading said financial instrument wherein the instructions are stated in one or more spoken or written languages or simplified elements from such languages; translating trading instructions into computer executable orders; and entering said computer executable orders into said at least one selected market for execution.