管理会计(英文版)课后习题答案(高等教育出版社)chapter3.doc

管理会计（高等教育出版社） 于增彪（清华大学） 改编 余绪缨（厦门大学） 审校 CHAPTER 3Activity cost behavior questions for writing and discussion 1. Knowledge of cost behavior allows a manager to assess changes in costs that result from changes in activity. This allows a manager to assess the effects of choices that change activity. For example, if excess capacity exists, bids that at least cover variable costs may be totally appropriate. Knowing what costs are variable and what costs are fixed can help a manager make better bids. 2. The longer the time period, the more likely that a cost will be variable. The short run is a period of time for which at least one cost is fixed. In the long run, all costs are variable. 3. Resource spending is the cost of acquiring the capacity to perform an activity, whereas resource usage is the amount of activity actually used. It is possible to use less of the activity than what is supplied. Only the cost of the activity actually used should be assigned to products. 4. Flexible resources are those acquired from outside sources and do not involve any long-term commitment for any given amount of resource. Thus, the cost of these resources increases as the demand for them increases, and they are variable costs (varying in proportion to the associated activity driver). 5. Committed resources are acquired by the use of either explicit or implicit contracts to obtain a given quantity of resources, regardless of whether the quantity of resource available is fully used or not. For multiperiod commitments, the cost of these resources essentially corresponds to committed fixed costs. Other resources acquired in advance are short term in nature and essentially correspond to discretionary fixed costs. 6. Committed fixed costs are those incurred for the acquisition of long-term activity capacity and are not subject to change in the short run. Annual resource expenditure is independent of actual usage. For example, the cost of a factory building is a committed fixed cost. Discre