Should Box Company continue to outsource the cartons?
Exhibit 10-2 presents an incremental analysis of the two alternatives. All relevant costs are listed. Because the machinery has already been purchased and neither the machinery nor the required factory space has any other use, the depreciation costs and other fixed overhead costs are the same for both alternatives; therefore, they are not relevant to the decision. The cost of making the needed cartons is $28,800. The cost of buying 20,000 cartons at the increased purchase price will be $30,000. Since the company would save $1,200 by making the cartons, management will decide to make the cartons.