2012年秋季微观经济学网上作业2

一、单项选择题1、在完全竞争市场上，厂商实现短期均衡的条件是（）A、P＝ARB、P＝MRC、P＝SMCD、P＝SAC2、在微观经济学中，对（）行业的长期均衡状态的分析通常被用来作为对消费者统治说法的一种证明。

A、完全垄断B、完全竞争C、垄断竞争D、寡头竞争3、短期内，一个完全竞争厂商所得到的价格若低于以下哪种成本就会停止营业（）。

A、平均总成本B、平均可变成本C、短期边际成本D、平均固定成本4、根据完全竞争市场的条件，下列（）行业最接近完全竞争行业。

A、自行车行业B、服装行业C、玉米行业D、烟草行业5、在一个完全竞争的市场上，厂商所面临的需求曲线与其长期平均成本曲线相切是（）。

A、厂商在长期内要得到超额利润的条件B、该行业内厂商的数目不再变化的条件C、厂商在长期内要得到最大利润的条件D、以上说法中B和C都是正确的6、在短期内，（）是完全竞争厂商的关闭点。

A、SAC曲线与SMC曲线的交点B、MR曲线与SMC曲线的交点C、AVC曲线与SMC曲线的交点D、AFC曲线与SMC曲线的交点7、假定一个完全竞争行业内某厂商在目前产量水平上的边际成本、平均总成本和平均收均等于1美元，则这家厂商（）。

A、肯定只得到正常利润B、肯定没得到最大利润C、是否得到了最大利润还不能确定D、肯定得到了最少利润8、在短期内，（）是完全竞争厂商的收支相抵点。

A、SAC曲线与SMC曲线的交点B、MR曲线与SMC曲线的交点C、AVC曲线与SMC曲线的交点D、MR曲线与SAC曲线的切点9、在完全竞争的条件下，如果厂商把产量调整到平均总成本曲线最低点所对应的水平（）。

A、他将获得最大利润B、他不能获得最大利润C、他是否获得最大利润仍无法确定D、他一定亏损10、如果某厂商的边际收益大于边际成本，那么为了取得最大利润（）。

A、他在完全竞争的条件下应该增加产量，在不完全竞争条件下则不一定B、他在不完全竞争条件下应该增加产量，在完全竞争条件则不一定C、任何条件下都应该增加产量D、任何条件下都应该减少产量11、垄断厂商利润极大时（）。

东财《微观经济学》在线作业二-0002
古诺竞争的一个重要特征是()
A:所有成本都是可变的
B:产量易于改变
C:固定成本是总成本中较大的部分
D:资本品存量易于改变
参考选项：B
古典经济学的政策主张是（）
A:国家干预
B:自由放任
C:扩大出口
D:储存金银
参考选项：B
如果企业可以调整所有的生产要素投入，那么是处在（）
A:市场期
B:长期
C:短期
D:都有可能
参考选项：B
某企业是某地区市场上唯一的墙纸生产企业，该墙纸与市场上另一企业生产的产品M有正的交叉弹性，与产品N有负的交叉弹性，则该企业（）
A:是完全垄断企业
B:不是完全垄断企业，因为有替代品M
C:不是完全垄断企业，因为有互补品N
D:难以判断是否完全垄断
参考选项：B
无差异曲线上任意一点上的商品X和商品Y的边际替代率是等于它们的（）A:价格之比
B:数量之比
C:边际效用之比
D:边际成本之比
参考选项：C
消费者对某物品的需求量与价格成反方向变动是因为（）
A:总效用递减
B:边际效用递减
C:消费过剩
D:总效用不变
1。

《微观经济学》第二章供求与局部均衡作业一、简释下列概念经济人需求需求函数供给供给函数均衡价格需求量的变动和需求的变动供给量的变动和供给的变动内生变量和外生变量弹性弧弹性点弹性需求的价格弹性供给的价格弹性需求的交叉价格弹性替代品互补品需求的收入弹性恩格尔定律二、选择正确答案（单项选择）1、在得出某棉花种植农户的供给曲线时，下列除哪一个因素以外其余均保持常数？A．土壤的肥沃程度；B．技术水平；C．棉花的种植面积；D．棉花的价格2、在某一时期内彩色电视机的需求曲线向左平移的原因可以是A．彩色电视机的价格上升；B．消费者对彩色电视机的预期价格上升；C．消费者对彩色电视机的预期价格下降；D．消费者的收入水平提高；E．黑白电视机的价格上升3、某月内，X商品的替代品的价格上升和互补品的价格上升，分别引起X商品的需求变动量为50单位和80单位，则在它们共同作用下该月X商品的需求数量A．增加30单位；B．减少30单位；C．增加130单位；D．减少130单位；4、如果一条线性的需求曲线与另一条曲线形的需求曲线相切，则在切点处两条需求曲线的需求的价格弹性系数：A．不相同；B．相同；C．可能相同，也可能不相同；D．根据切点的位置而定；5、假定玉米市场的需求是缺乏弹性的，玉米的产量等于销售量且等于需求量，恶劣的气候条件使玉米产量下降20%，在这种情况下，A．玉米生产者的收入减少，因为玉米产量下降了20%；B．玉米生产者的收入增加，因为玉米价格上升低于20%；C．玉米生产者的收入增加，因为玉米价格上升超过20%；6、当两种商品中一种商品的价格发生变化时，这两种商品的需求量都同时增加或减少，则这两种商品的需求的交叉价格弹性系数为A.正；B.负；C.0；D.17、已知某商品的收入弹性=1.2，则这种商品是（）。

A.低档商品；B.一般的正常商品负；C.奢侈品；D.吉芬商品8、已知某商品的收入弹性=0.6，则这种商品是（）。

A.低档商品；B.一般的正常商品；C.奢侈品；D.吉芬商品9、已知某商品的收入弹性= -0.8，则这种商品是（）。

微观经济学作业答案2Managerial EconomicsHOMEWORK SET#2 Name:Class:Student #:(Due day: Next class)Part 1:1. The price of good A goes up. As a result the demand for good B shifts to the left. From this we can infer that:a. good A is a normal good.b. good B is an inferior good.c. goods A and B are substitutes.d. goods A and B are complements.e. none of the above.Choose: d) the definition os complements2. Joe's budget line is 15F + 45C = 900. When Joe chooses his most preferred market basket, he buys 10 units of C. therefore, he also buys :a. 10 units of Fb. 30 units of Fc. 50 units of Fd. 60 units of Fe. None of the aboveChoose: b) We assume that Joe will spend all his income. If C = 10, then 15F =900 – 45(10) =450, so F = 450/15 =30.3. Kim only buys coffee and compact discs. Coffee costs $0.60 per cup, and CDs cost $12.00 each. She has $18 per week to spend on these two goods. If Kim is maximizing her utility, her marginal rate of substitution of coffee for CDs is:a. 0.05b. 20c. 18d. 1.50e. None of the above Choose: a) At Kim's most preferred market basket, her MRS equals the price ratio (Pcoffee/PCD), which equals 0.6/12 or 0.05.4. The bandwagon effect corresponds best to which of the following?a. snob effect.b. external economy.c. negative network externality.d. positive network externality.Choose: d)5. A Giffen gooda. is always the same as an inferior good.b. is the special subset of inferior goods in which the substitution effect dominates the income effect.c. is the special subset of inferior goods in which the income effect dominates the substitution effect.d. must have a downward sloping demand curve.Choose: c) the definition of Giffen good6. An Engel curve for a good has a positive slope if the good is :a. an inferior good.b. a Giffen good.c. a normal good. d. a, b, and c are true.e. None of the above is true.Choose: c) Inferior and Giffen goods have negatively sloped Engel curves.7. The price of beef and quantity of beef traded are P* and Q*, respectively. Given this information, consumer surplus is the area:a. 0BCQ*b. ABCc. ACP*d. CBP*e. 0ACQ* Choose: d)Consumer surplus is the area between the demand line and the price.8. In Figure 1, holding income constant, what change must have occurred to rotate the budget line from the old line(1) to the new line(2)?Figure 1a. The price of Coke fellb. The price of pizza fellc. The price of pizza rosed. The price of Coke went upe. b and cChoose: b) The horizontal intercept, I/PC, is unchanged, which implies that PC could not have changed (holding income constant). Since the slope is PP/PC, the slope change means that the price of pizza must have fallen. This can also be seen intuitively from Figure 1, since the consumer can now buy more pizza than before if he spends all his income on pizza. 9.Andy buys 10 pounds of onions per month when the price is $0.75 per pound. If the price falls to $0.50 per pound, he buys 30 pounds of onions. What is his arc elasticity of demand over this price range?a. - 1.33b.–2c.–2.5d. - 6e. None of the above is correct. Choose: c) Using the arc elasticity formula,5.22)1030(2)75.050.0()75.050.0()1030(-=÷+÷??--==Q P P Q EP The next two questions refer to the following information: Opie and Gomerare the only two consumers in the video cassette rental market in the Mayberry. Their demand curves per week are pictured in Figure 2.10. If rentals cost $2.50 each, the total quantity demanded each week in the market is :a. 3b. 6c. 15d. 10e. None of the above is correct. Choose: b) Add horizontally to get the market demand curve. At P = $2.50, QO = 3 and QG =3 for a total of 6 units demanded.11. For a decrease in price from $2.50 to $1.50, market demand is :a. elastic.b. unit elastic. c. inelastic.d. perfectly inelastic.e. More information is needed. Choose: a) Demand is price elastic:EP = %ΔQ/%Δ(a)Figure 212. As president and CEO of MegaWorld industries, you must decide on some very risky alternative investments:a. A.c. C.d. D.e. E Choose: b) Ea=2 Eb=6.8 Ec=0 Ed=6 Ee=613. An individual with a constant marginal utility of income will bea. risk averse.b. risk neutral.c. risk loving.d. insufficient information for a decision. Choose: b)An individual with a constant marginal utility of income is risk neutral.14. In the figure below, what is true about the two jobs?a.Job 1 has a lower standard deviation than Job 2.b.All outcomes in both jobs have the same probability of occurrence.c. A risk-averse person would prefer Job 2.d. A risk-neutral person would prefer Job 1.e.Job 1 has a higher expected income than Job 2.Choose: a) Job 1 has a lower standard deviation than Job 2. Expected income of Job 1 equals to Job 2.Part 2:The demand curves for steak, eggs, and hot dogs are given in the table below. The current price of steak is $5. The price of eggs is $2.50, and the price of hot dogs is $0.75. Fill in the remaining columns of the table using this information. Indicate which goods are substitutes andSolution:Steak and eggs are complements. Steak and hotdogs and eggs and hotdogs are substitutes.Part 3:Draw indifference curves to represent the following descriptions of consumer preferences:a. I can’t taste the difference between apple and grape jelly, but I like them both.b. I only like grape jelly and never eat apple jelly.c. Apple and grape jelly are better mixed, although I don’t care too much about the proportions.Answer:a) See Figure 7(a). Since the consumer can not tell the difference between the two flavors, all he would care about is the total amount of jelly he has.b) See Figure 7(b). An increase in the amount of apple jelly does not affect the consumer since he never eats it.c) See Figure 7(c). Here, a mixed bundle is better than an extreme one, but the consumer is willing to trade off the different flavors.Figure 7There are reasons other than fads, fashions, and consumer insecurity for bandwagon and snob effects. Various types of externalities in the consumption of certain goods also exist. Explain which these effects (bandwagon or snob) might be present in the following cases: a. A restaurant that is often crowded b. A personal computer software product c. A rock concertAnswer:a) A price decrease will attract more customers, but the crowding(longer lines, poorer service) will discourage others. This would resemble a snob effect.b) The more people you expect to buy a software product, the more likely you can find another experienced user to ask questions about it. Also, the more likely it is that a computer bookstore will carry publications about how to use the software. Thus, we would expect to see a bandwagon effect.Ounces of Grape Jelly Ounces of Apple Jelly (a)Ounces of Grape JellyOunces of Apple Jelly(b)(c)Ounces of Grape JellyOunces ofApple Jellyc) Here, crowding might discourage some customers. But, since part of the enjoyment of a concert is seeing the band with other fans, we might observe a bandwagon effect.Part 5: Tom Wilson is the operations manager for Bi-Corp, a real estate investment firm. Tom must decide if Bi-Corp is to invest in a strip mall in a northeast metropolitan area. If the shopping center is highly successful, after tax profits will be $100,000 per year. Moderate success would yield an annual profit of $50,000, while the project will lose $10,000 per year if it is unsuccessful. Past experience suggests that there is a 40% chance that the project will be highly successful, a 40% chance of moderate success, and a 20% probability that the project will be unsuccessful.a. Calculate the expected value and standard deviation of profit.b. The project requires an $800,000 investment. If Bi-Corp has an 8% opportunity cost on invested funds of similar riskiness, should the project be undertaken? Solution:a.Expected Value∑==n1i ^i ^i P πππi ^P i ^ πi ^P i ^100,000 .4 40,00050,000 .4 20,000 -10,000 .2 -2,000π = 58,000Standard deviationσππ=-=∑i2i ^i 1nPπi ^ ππi -ππi 2-ππi 2P -100,000 42,000, 764,000,000 705,600,00050,000 -8,000 64,000,000 25,600,000 -10,000 -68,000 4,624,000,000 924,800,000 σ2 = 1,656,000,000σ = 40,693.98 b.Bio-Corp's opportunity cost is 8% of 800,000 or 0.08 x 800,000 = 64,000.The expected value of the project is less than the opportunity cost. Bi-Corp should not undertake the project.。

东北财经大学智慧树知到“公共课”《微观经济学》网课测试题答案（图片大小可自由调整）第1卷一.综合考核(共15题)1.按照古诺模型，下列说法正确的是()。

A.双方垄断者没有认识到他们的相互依赖性B.每个寡头垄断都假定对方保持产量不变C.均衡结果是稳定的D.每个寡头垄断都假定对方保持价格不变E.以上答案均正确2.序数效用论者把()结合在一起来说明消费者均衡A.边际效用递减规律B.无差异曲线C.预算线D.需求曲线E.以上均是3.在完全竞争市场条件下，产品的价格刚好处于企业的最低平均可变成本，那么该企业()A.有亏损，为了弥补亏损而继续生产B.其经济收益不能弥补固定成本，停止生产C.其亏损为全部可变成本D.其亏损为全部总成本4.为了提高资源配置效率，政府对自然垄断部门的垄断行为是：()。

A.坚决反对B.不管的C.尽量支持D.加以管制5.下列条件中与完全竞争市场中短期均衡条件不相符的是()A.P=MPB.MC=MRC.P=MCD.MC=AR6.垄断竞争市场企业的短期均衡发生于()。

A.边际成本等于D需求曲线中产生的边际收益时B.平均成本下降时C.D需求曲线平均成本曲线相切时D.主观需求曲线与D需求曲线相交，并且边际成本等于D需求曲线对应的边际收益时7.劳动力边际收益曲线的高度取决于()。

A.资本数量B.工人的技术和动机C.企业的动机D.产品的价格E.工资水平8.恩格尔系数可以作为衡量()的重要指标。

A.居民消费水平B.国家贫富C.国民收入D.技术进步E.以上答案均正确9.工资率上升所导致的替代效应是指：()A.工作同样长的时间可以得到更多的收入B.工作较短的时间也可以得到同样的收入C.工人宁愿工作更长的时间，以收入带来的享受代替闲暇带来的享受D.工人宁愿工作较短的时间，以闲暇带来的享受代替收入带来的享受10.在完全竞争市场上，对于某一种用途的土地而言，其地租率的决定因素应为()A.地主的定价B.土地的供给曲线C.土地的需求曲线D.以上均是11.垄断竞争市场企业的短期均衡发生于()A.边际成本等于D需求曲线中产生的边际收益时B.平均成本下降时C.D需求曲线与平均成本曲线相切时D.主观需求曲线与D需求曲线相交，并且边际成本等于D需求曲线对应的边际收益时12.微观经济学的基本假设是()A.完全理性B.市场出清C.完全信息D.政府需要干预E.以上均是13.完全竞争市场上，超额利润存在的条件是()。

华东理工大学网络教育学院《微观经济学》课程阶段练习二（第四章——第五章）一、单项选择题1、对于--种商品，消费者想要有的数量都已有了，这时，（）0A.边际效用最大；B.边际效用为零；C.总效用为零；D边际效用为负2、如果商品X对于商品Y的边际替代率MRS小于X和Y的价格之比P（X）/P（Y）,则（）A、该消费者获得了最大效用；B、该消费者应该增加X的消费，减少Y的消费；C、应该调整X和Y的价格；D、该消费者应该减少X的消费，增加Y的消费；3、序数效用论认为，商品效用的大小（）oA.取决于它的使用价值；B.取决于它的价格；C.不可比较；D.可以比较4、无差异Illi线的形状取决于（）。

A.消费者偏好；B.消费者收入；C.所购商品的价格；D.商品效用水平的大小5、某个消费者的无差异曲线图包含无数条无差异曲线，因为（）。

A.收入有时高，有时低；B.欲望是无限的；C.消费者人数是无限的；D.商品的数量是无限的6、边际成本低于平均成本吋（）0A.平均成本上升；B.平均可变成木口J能上升也可能下降；C.总成木下降；D.平均可变成本上升。

7、短期平均成本曲线成为U形的原因与（）。

A.规模报酬有关；B.外部经济与不经济冇关；C.要素的边际生产率有关；D.固定成本与可变成本所占比重有关。

8、长期平均成本曲线成为U形的原因（）。

A.规模报酬有关；B.外部经济与不经济有关；C.要素的边际生产率有关；D.固定成本与可变成本所占比重有关。

9、如果以利润授大化为冃标的企业的边际收益小于边际成本，那么，该企业（）A、应该增加其产最B、应该减少其产量C、必然获得经济利润D、必然处于亏损状态10、边际技术替代率递减规律表明：当每增加1单位劳动（）A、保持产量不变时，资本量减少较多B、保持产量不变时，资本量减少较少C、如果资木最保持不变，产最就会增加的更多D、如果资本量保持不变，产量的增加会更少二、判断题1、当边际效用为零吋，总效用最小。