式子用计算器算最快怎么按啊

discount rate是利率r吗？

老师，这一题说的赤字是财政赤字还是贸易赤字啊？我用这个NX＝S－I－(G－T)根本分析不出正确答案呀

01.单选题 已收藏 标记 纠错 In perfectly competitive industries, what is the most likely long-run effect of a permanent decrease in demand? A Price decreases. B Firm incur economic losses. C The number of firms decreases. 查看解析 下一题 正确答案C 您的答案A本题平均正确率：58% Perfect competition难度：一般 推荐：      答案解析 A permanent decrease in demand in a perfectly competitive industry will in the short-run cause the demand curve to shift to the left, causing prices to fall. However, in the long-run, firms will leave the industry due to economic losses. As firms leave the industry, supply decreases (i.e., the supply curve shifts left-ward) thus increasing prices back to the equilibrium where economic profit is zero. 问：这题怎么确定是短期 和 长期的结点，能不能用图示意之？

从longrun的角度时，央行才能用money supply进行调节经济 短期内，money supply是常数。 那为什么这一题 money supply growth 在长期不会影响real output

问：需求向右平移是已知给的，供给向右平移是通过 cost降低分析出来的，所以最终的交点价格上升还是下降不确定吧？ 如图

04.单选题 收藏 标记 纠错 To minimize total costs for a desired level of output, which of the following is the most efficient combination of labor and capital? A Equalize marginal product obtained per dollar spent on labor to the marginal product per dollar spent on capital. B Equalize average product of labor to the average product of capital. C Equalize marginal product per unit of labor to the marginal product per unit of capital. 查看解析 上一题 下一题 正确答案A 您的答案A本题平均正确率：55% Economies of scale and diseconomies of scale难度：一般 推荐：      答案解析 Costs are minimized when substitution of labor for capital (or the reverse) does not result in any cost savings, which is the case when the marginal product per dollar spent is equalized across inputs. 问：这道题 能不能讲解的再详尽一些？因为 基础课视频里这方面几乎没有涉及到？

Which of the following most accurately describes economies of scale? A Economies of scale increase at a decreasing rate. B Economies of scale occur when long-run unit costs fall as output increases. C Economies of scale are dependent on short-run average costs. 查看解析 上一题 下一题 正确答案B 您的答案B本题平均正确率：76% Economies of scale and diseconomies of scale难度：一般 推荐：      答案解析 Economies of scale occur when the percentage increase in output is greater than the percentage increase in the cost of all inputs. Economies of scale occur over the range where the long-run average cost curve slopes downward. 问：1.对应我画的图（左），看规模效应这一边 这条包络线的斜率的绝对值应该是越来越小，所以意味着 规模经济效应以一个降低的速率上升吧，不正是A形容的吗？2.我画的图（右），讲解里说 规模经济的另一种理解：Q增增 TC增，如果对应图的话 是不是我在图中用绿色线描出来的部分？

问：1.对应我画的图（左），看规模经济这半边 这条包络线的斜率的绝对值应该是越来越小，所以意味着 规模经济效应以一个降低的速率上升吧，不正是A形容的吗？2.我画的图（右），讲解里说 规模经济的另一种理解：Q增增 TC增，如果对应图的话 是不是我在图中用绿色线描出来的曲线部分？ 两个独立的问题 请逐次回答 谢谢

请问可剥离交易的且拥有有限寿命的是可以摊销的对吧？否则即无法摊销对吧？