Economic Order Quantity (EOQ) model determines the optimal order size by balancing fixed order cost and inventory holding cost. Cost parameters involved in EOQ model include costs for physically holding inventory such as facility, utilities, insurance, labor, etc., opportunity cost as well as costs for placing order, transportation, and order receipt. One property of EOQ formula, however, suggests that it is not absolutely critical to estimate the cost parameters accurately in implementing the EOQ model. Explain how EOQ model is robust in terms of the total cost against minor errors in estimation of cost parameters.