Why do overhead costs often shift from high-volume products to low-volume products when a company switches from a conventional costing method to activity-based costing? How does this improve the accuracy of product costs?

In what ways are job-order and process costing similar? In what ways are they dissimilar? Think of a company / business you are working for (or have worked for). Are the products or services they provide better suited to Job order or process costing?