Question 1 — Derived Demand for Labor (劳动的派生需求)
Why do firms demand labor even though consumers do not directly “want” labor?
为什么在消费者并不直接“需求”劳动的情况下，企业仍然会对劳动提出需求？
📖 点击查看答案
Because labor demand is derived from the demand for the final goods and services labor helps produce.
因为劳动需求源自劳动所生产的最终商品与服务的需求（派生需求）。
📝 点击查看解析
（若含公式示例：）
Firms hire workers only to produce outputs that can be sold; if product demand rises, MRPL rises and labor demand shifts right.
企业雇人是为了生产可销售的产出；当产品需求上升，劳动的边际收益产品上升，劳动需求右移。
Question 2 — MRPL vs. VMP (边际收益产品 vs 边际产品价值)
Under perfect competition, is the marginal revenue product of labor (MRPL) equal to the value of marginal product (VMP)? Explain.
在完全竞争下，劳动的边际收益产品（MRPL）是否等于边际产品价值（VMP）？请解释。
📖 点击查看答案
Yes. Under price-taking behavior, MRPL = P × MPL = VMP.
是的。在价格接受者条件下，MRPL = 价格 × 劳动边际产量 = VMP。
📝 点击查看解析
With P fixed for a competitive firm, extra revenue from one more unit of output equals P; hence each worker’s extra revenue is , identical to VMP.
竞争企业的产品价格固定，新增一单位产出带来的边际收益等于价格 ；因此一名工人的额外收益为 ，即 VMP。
Question 3 — Diminishing Returns (边际报酬递减)
State the law of diminishing returns in the context of labor holding other inputs fixed.
在其他要素不变的情况下，说明劳动的“边际报酬递减规律”。
📖 点击查看答案
As additional workers are hired while capital/space is fixed, each extra worker adds less to total output than the previous one.
当资本/空间固定而继续增雇工人时，后来的每位工人对总产出的增量小于前一位。
📝 点击查看解析
Initially specialization can raise MPL, but congestion sets in; the declining MPL makes MRPL slope downward, forming the firm’s labor demand curve.
起初分工协作可提高 MPL，但随后拥挤与资源稀释使 MPL 下降，进而使 MRPL 向下倾斜，这就是企业的劳动需求曲线。
Question 4 — Movement vs. Shift (沿曲线移动 vs. 曲线位移)
What causes a movement along the labor demand curve and what causes the curve to shift?
是什么导致沿劳动需求曲线的“移动”，又是什么导致“曲线位移”？
📖 点击查看答案
Wage changes cause movements along the curve; productivity, output price, complementary inputs, and number of firms cause shifts.
工资变化引起沿曲线移动；生产率、产品价格、互补要素、企业数量等变化引起曲线位移。
📝 点击查看解析
Holding shifters constant, changing W moves you along MRPL. When P, MPL, technology, or market size changes, the entire MRPL schedule shifts.
在其他条件不变时，工资变动使企业在既定 MRPL 上移动；当价格、MPL、技术或行业规模变化时，MRPL 整体右移或左移。
Question 5 — Backward-Bending Labor Supply (反向弯曲的劳动供给)
Why might an individual supply fewer hours of labor at very high wages?
为何在极高工资下，个人可能反而减少供给的工作时长？
📖 点击查看答案
Because the income effect can outweigh the substitution effect, making additional leisure more valuable than extra income.
因为收入效应可能超过替代效应，额外闲暇比额外收入更有价值。
📝 点击查看解析
At high wages, a small reduction in hours still preserves high income; people “purchase” more leisure, bending the supply curve backward.
在高工资下，少工作一些仍有高收入，人们“购买”更多闲暇，供给曲线因此向后弯曲。
Question 6 — Human Capital (人力资本)
Define human capital and explain how it affects labor demand.
定义人力资本，并说明其如何影响劳动需求。
📖 点击查看答案
Human capital is the stock of skills, knowledge, and experience that raises productivity; higher human capital increases MRPL and shifts labor demand right.
人力资本是能提升生产率的技能、知识与经验存量；人力资本越高，MRPL 越大，劳动需求曲线右移。
📝 点击查看解析
Training and education raise MPL; since , firms are willing to pay higher wages and hire more workers.
培训与教育提高 MPL；因 ，企业愿以更高工资雇佣更多劳动者。
Question 7 — Monopsony vs. Monopoly (买方垄断 vs. 卖方垄断)
How do monopsony in labor markets and monopoly in product markets symmetrically distort quantities and prices/wages?
劳动市场中的买方垄断与产品市场中的卖方垄断如何以对称方式扭曲数量与价格/工资？
📖 点击查看答案
Both restrict quantities below competitive levels; monopoly raises price, monopsony lowers wage.
两者都把数量压低到竞争水平以下；垄断提高价格，买方垄断压低工资。
📝 点击查看解析
Monopoly sets MR=MC → Q↓, P↑; monopsony sets ME=MRPL → L↓, W↓. In both cases, deadweight loss arises relative to competitive equilibrium.
垄断令 MR=MC → 产量降、价格升；买方垄断令 ME=MRPL → 雇佣量降、工资降；相对竞争均衡都产生无谓损失。
Question 8 — Role of Unions in a Monopsony (工会在买方垄断下的作用)
Why can a moderate union wage floor increase employment in a monopsonistic labor market?
为何在买方垄断的劳动市场中，适度的工会工资底线反而能提高就业？
📖 点击查看答案
It makes the supply effectively horizontal at the floor, so the firm hires where MRPL intersects the floor—often at a higher L than under monopsony.
工资底线使供给在该水平变为水平线，企业在 MRPL 与底线相交处雇佣，通常比无工会时的 L 更高。
📝 点击查看解析
By lowering the firm’s marginal expenditure per added worker up to the floor, the distortion of “wage rising with own hiring” is removed, expanding employment.
在底线以下，新增一人不再抬升整体工资率，边际支出下降，纠正了买方垄断的扭曲，从而扩大就业。
Question 9 — Economic Rent with Fixed Supply (固定供给与经济地租)
When the supply of a factor is perfectly inelastic (vertical), what determines its price, and what is “economic rent”?
当某要素的供给完全无弹性（垂直）时，其价格由什么决定？“经济地租”指什么？
📖 点击查看答案
Price is fully demand-determined; economic rent is the payment above the factor’s opportunity cost due solely to scarcity.
价格完全由需求决定；经济地租是因稀缺而高于机会成本的那部分支付。
📝 点击查看解析
With fixed Q, any demand shift changes only P. The gap between P and minimal required payment (often near zero for fixed land) is rent.
数量固定，需求右移只抬价不增量；价格与最低必要报酬之间的差额即地租。
Question 10 — Capital Market Analogy (资本市场类比)
State the profit-maximizing rule for capital usage and compare it to the labor hiring rule.
给出资本使用的利润最大化规则，并与劳动雇佣规则进行比较。
📖 点击查看答案
Use capital until MRPK equals the rental rate r; hire labor until MRPL equals the wage W.
资本使用到 MRPK = 租金率 r；劳动雇佣到 MRPL = 工资 W。
📝 点击查看解析
Both rules equate marginal benefit with marginal cost for each input. Under competition, factor prices (W, r) reflect marginal productivity, ensuring efficient allocation.
两条规则都令“边际收益 = 边际成本”。在竞争环境下，要素价格（W、r）等于边际生产力，实现资源的有效配置。