Excess/idle capacity cost for a product group is an example of an attributable cost. If these costs are assigned
to the products produced, production managers who become more efficient (doing the same amount of
work with less resources) will only see distorted product costs arbitrarily inflated by allocation of the excess/
idle costs. The excess/idle capacity costs instead should be attributed to the product group the particular
machine is dedicated to. Utilizing excess/idle capacity achieved by efficiency improvements should be the
responsibility of sales, marketing, or general management