网课知到微观经济学（四川大学）智慧树答案

第一章 单元测试

1、单选题：Microeconomics studies the allocation of
A:scarce resources.
B:unlimited resources.
C:models.
D:decision makers.
正确答案:【scarce resources.】

2、单选题：Most microeconomic models assume that decision makers wish to
A:make themselves as well off as possible.
B:make others as well off as possible.
C:act selfishly.
D:None of the above.
正确答案:【make themselves as well off as possible.】

3、单选题：What links the decisions of consumers and firms in a market?
A:microeconomics.
B:prices.
C:the government.
D:coordination officials.
正确答案:【prices.】

4、单选题：Economic models are most often tested
A:using data from the distant past.
B:using data from the real world.
C:using computer simulations.
D:using logic alone.
正确答案:【using data from the real world.】

5、单选题：Which of the statements below is/are normative?
A:B and C
B:Microeconomists study economic growth.
C:Economists will use a model until it is refuted by someone.
D:Economists need to include more reality in their models.
正确答案:【Economists need to include more reality in their models.】

第二章 单元测试

1、单选题：An indifference curve represents bundles of goods that a consumer
A:refers to any other bundle of goods.
B:ranks from most preferred to least preferred.
C:views as equally desirable.
D:All of the above.
正确答案:【views as equally desirable.】

2、单选题：Convexity of indifference curves implies that consumers are willing to
A:acquire more “x” only if they do not have to give up any “y”.
B:settle for less of both “x” and “y”.
C:give up more “y” to get an extra “x” the more “x” they have.
D:give up more “y” to get an extra “x” the less “x” they have.
正确答案:【give up more “y” to get an extra “x” the less “x” they have.】

3、单选题：If two bundles are on the same indifference curve, then
A:no comparison can be made between the two bundles since utility cannot really be measured.
B:B and C.
C:the consumer derives the same level of ordinal utility from each but not the same level of cardinal utility.
D:the consumer derives the same level of utility from each.
正确答案:【the consumer derives the same level of utility from each.】

4、单选题：If the utility for two goods “x” and “y” is measured as U = x + y, then it can be concluded that
A:”x” and “y” are perfect substitutes.
B:”x” and “y” are perfect complements.
C:”x” and “y” are both bads.
D:the indifference curves on the x,y graph will be upward sloping.
正确答案:【“x” and “y” are perfect substitutes.】

5、单选题：Joe’s income is $500, the price of food (F) is $2 per unit, and the price of shelter (S) is $100. Which of the following represents his budget constraint?
A:F = 250 – 50S
B:S = 5 – .02F
C:All of the above.
D:500 = 2F + 100S
正确答案:【All of the above.】

第三章 单元测试

1、单选题：The consumer is in equilibrium when
A:Px/Py. = MUx/MUy.
B:All of the above.
C:the budget line is tangent to the indifference curve at the bundle chosen.
D:MRT = MRS.
正确答案:【All of the above.】

2、单选题：By selecting a bundle where MRS = MRT, the consumer is saying
A:”I value my last unit of each good equally.”
B:”I am willing to trade one good for the other at the same rate that I am required to do so.”
C:All of the above.
D:”I will equate the amounts spent on all goods consumed.”
正确答案:【“I am willing to trade one good for the other at the same rate that I am required to do so.”】

3、判断题：If MRS > MRT, then the consumer is better off than at equilibrium.
A:错
B:对
正确答案:【错】

4、单选题：An individual’s demand curve for a good can be derived by measuring the quantities selected as
A:income changes.
B:All of the above.
C:the price of the good changes.
D:the price of substitute goods changes.
正确答案:【the price of the good changes.】

5、单选题：Sandy derives utility from consuming “all other goods,” g, and clean air (measured by particulate matter removed per m3), a, as measured by the utility function U(g,a) = g0.6a0.4. The price of “all other goods” is $20 and the price of clean air (abatement) equals $10. Brian is the only other consumer in the market for clean air and demands 10 units of clean air. What is the market demand for clean air?
A:Total market demand is 16 units of clean air.
B:Total market demand is 10 units of clean air.
C:Total market demand is 14 units of clean air.
D:Total market demand is 12 units of clean air.
正确答案:【Total market demand is 14 units of clean air.】

第四章 单元测试

1、单选题：Efficient production occurs if a firm
A:maximizes profit.
B:All of the above.
C:given the quantity of inputs, cannot produce more output.
D:cannot produce its current level of output with fewer inputs.
正确答案:【All of the above.】

2、单选题：Firms maximize profit when
A:the additional benefit from producing a good equals the additional cost of producing that good.
B:All of the above.
C:the derivative of the profit function with respect to output is zero.
D:MR = MC.
正确答案:【All of the above.】

3、单选题：With respect to production, the short run is best defined as a time period
A:lasting about two years.
B:in which all inputs are fixed.
C:lasting about six months.
D:in which at least one input is fixed.
正确答案:【in which at least one input is fixed.】

4、单选题：In the long run, all factors of production are
A:materials.
B:rented.
C:variable.
D:fixed.
正确答案:【variable.】

5、单选题：A production function tells the firm
A:the minimum it can expect to produce with a given mix of inputs.
B:the average it can expect to produce with a given mix of inputs.
C:the average level of production for other firms in the industry.
D:the maximum it can expect to produce with a given mix of inputs.
正确答案:【the maximum it can expect to produce with a given mix of inputs.】

第五章 单元测试

1、单选题：A production function tells the firm
A:the minimum it can expect to produce with a given mix of inputs.
B:the average level of production for other firms in the industry.
C:the average it can expect to produce with a given mix of inputs.
D:the maximum it can expect to produce with a given mix of inputs.
正确答案:【the maximum it can expect to produce with a given mix of inputs.】

2、单选题：Which of the following statements is NOT true?
A:AC = AFC + AVC
B:C = F + VC
C:AVC = wage/MPL
D:AFC = AC – AVC
正确答案:【AVC = wage/MPL】

3、单选题：Suppose the total cost of producing T-shirts can be represented as TC = 50 + 2q. The marginal cost of the 5th T-shirt is
A:2
B:60
C:10
D:12
正确答案:【2】

4、单选题：If average cost is decreasing,
A:marginal cost is less than average cost.
B:marginal cost equals average cost.
C:marginal cost exceeds average cost.
D:Not enough information is given.
正确答案:【marginal cost is less than average cost.】

5、单选题：Variable costs are
A:equal to total cost divided by the units of output produced.
B:the amount by which a firm’s cost changes if the firm produces one more unit of output.
C:a production expense that does not vary with output.
D:a production expense that changes with the quantity of output produced.
正确答案:【a production expense that changes with the quantity of output produced.】

第六章 单元测试

1、单选题：The Canadian metal chair manufacturing market has n = 78 firms. The estimated elasticity of supply is ηo = 3.1, and the estimated elasticity of demand is ε = – 1.1. Assuming that the firms are identical, calculate the elasticity of demand facing a single firm.
A:275.5
B:324.5
C:-275.5
D:-324.5
正确答案:【-324.5】

2、单选题：If the inverse demand function for toasters is p = 60 – Q, what is the consumer surplus if price is 30?
A:150
B:450
C:300
D:900
正确答案:【450】

3、单选题：market where no single buyer or seller can influence the price is
A:a competitive market
B:American market
C:a buyer’s market
D:a seller’s market
正确答案:【a competitive market】

4、单选题：If a competitive firm maximizes short-run profits by producing some quantity of output, which of the following must be true at that level of output?
A:p > MC
B:MR > MC
C:p ≥ AVC
D:All of the above
正确答案:【p ≥ AVC】

5、单选题：Assume a consumer has a horizontal demand curve for a product. His consumer surplus from buying the product
A:Need more information
B:equals zero
C:is maximized
D:cannot be calculated
正确答案:【equals zero】

第七章 单元测试

1、单选题：The deadweight loss generated by a perfect-price-discriminating monopoly
A:equals the sum of all lost consumer surplus.
B:is greater than the deadweight loss of a single-price monopoly.
C:equals zero.
D:equals the deadweight loss of a single-price monopoly.
正确答案:【equals zero.】

2、单选题：Monopolistically competitive firms
A:have no market power because price equals marginal cost.
B:have no market power because they earn zero economic profit.
C:have no market power because of free entry.
D:have market power because they can set price above marginal cost.
正确答案:【have market power because they can set price above marginal cost.】

3、单选题：A monopolist faces the inverse demand curve P = 60 – Q. It has variable costs of Q^2 so that its marginal costs are 2Q, and it has fixed costs of 30. The monopoly’s maximum profit is
A:220
B:370
C:510
D:420