A company is changing its costing system from traditional absorption costing based on labour hours to Activity Based Costing. It has overheads of $156,000 which are related to taking material deliveries.
The delivery information about each product is below.
Product: X Y Z
Total units required 1,000 2,000 3,000
Delivery size 200 400 1,000
Total labour costs are $360,000 for 45,000 hours. Each unit of each product takes the same number of direct hours.
Assuming that the company uses the number of deliveries as its cost driver, what is the increase or decrease in unit costs for Z arising from the change from Absorption Costing to Activity Based Costing?