An exemplary embodiment comprises a method for trading items among a plurality of traders, the method comprising: (a) receiving a first order for at least one item from one of the traders into an electronic trading system, wherein the first order provides priority for said at least one item but does not reserve said at least one item; (b) receiving, from another one of the traders, a second order into the electronic trading system that matches said first order; (c) determining that at least a portion of the first order is available to be filled by at least a portion of the second order; (d) reserving said at least a portion of said first order for execution against said at least a portion of said second order; and (e) executing said at least a portion of said first order against said at least a portion of said second order.