Plastic and Co manufactures industrial plastic containers. As petroleum prices fall, the price of plastic materials also falls. As a result, a: Plastic and Co’s marginal cost curve will shift.
b: The market price for the plastic containers will rise, other things equal.
c: The fixed cost curve for Plastic and Co would shift downward.
d: Average cost curve of plastic containers will shift upward.

When , a competitive firm will produce and earn economic profits.

a: marginal revenue is rising
b: marginal costs are decreasing
c: marginal revenue is above average costs
d: marginal revenue = average total cost = marginal costs

Jimmy's delicatessen sells large tins of tom tucker's toffee. the deli uses a periodic review system, checking inventory levels every 88 days, at which time an order is placed for more tins. order lead time is 22 days. daily demand is a constant 1515 tins, so average demand during the reorder period and order lead time (1010 days) is 150150 tins. draw a sawtooth diagram. assume that the beginning inventory level is equal to the restocking level and the desired service level is 99.9%. what is the safety stock level? (hint: look at the formula for calculating restocking level.) what is the average inventory level? the safety stock level is average inventory level is __chart: time (10,20,30), tins (0,150) lines touching both axisthe safety stock level is 0 tinsthe average inventory level is 75 tins