A computer-implemented method for performing dynamic cost accounting for an enterprise, wherein the enterprise includes a costing system. The method includes programmatically retrieving input information for the costing system, e.g., from one or more (possibly remote) information sources over a network, dynamically updating the costing system in accordance with the retrieved input information to generate an updated costing system, and the updated costing system calculating one or more outputs which are usable in managing the enterprise. The retrieving and update may occur periodically, e.g., monthly, weekly, per hour, minute, second, millisecond, etc., or on demand. In some embodiments, the enterprise may further include one or more optimizers, wherein the optimizers are provided with the one or more outputs of the costing system, and executed to determine one or more optimal operating parameters for the enterprise. The determined optimal operating parameters are then used to manage or execute enterprise operations.