premise: The amount ordered should be sufficient so that the number of units on hand plus those that are on order equal some  maximum  stocking quantity, S.13 For a particular item, our store buyer may reorder when the inventory level falls below s equals 4 units, in a quantity that brings the current inventory up to S equals 8 units.
hypothesis: The amount in which is ordered should be sufficient so that the number of units on hand plus those that are on order equal some stock quantity.