如果需求曲线是线性的且向下倾斜，下列哪项不正确？

Question

BlackTom AI · Accepted Answer

题干将需求曲线设为线性且向下倾斜，要求选择“不正确”的项。
首先要理解线性向下倾斜的需求曲线的两个关键特征：斜率是恒定的（因为线性），而价格-数量组合下的价格弹性并非恒定，而是在曲线上的不同点取值不同。
Option a（若存在与弹性随价格变动相关的描述）通常被视为正确，因为弹性确实会随价格和数量的位置而变化。
Option b（若描述需求曲线的某一段在特定情形下更具弹性或斜率的关系）若涉及到弹性与斜率的关系，需结合具体点来判断，不能一概而论，因此需要根据具体表述来判断其正确性。
Option c的陈述声称“沿曲线，弹性和斜率都将保持不变”。在一条线性且向下倾斜的需求曲线上，斜率确实是常数，但弹性并不保持不变，而会随点的不同而变化，因此该表述在理论上通常被视为不正确的说法。
Option d（若描述在曲线上的不同点弹性或斜率的变化趋势）若包含弹性变化或斜率恒定的对比，需结合具体措辞逐项核对，通常在线性需求下弹性不恒定这一点会影响其正确性。
综上所述，按照线性向下需求曲线的标准理解，关于“弹性和斜率都将保持不变”的说法在弹性并非恒定的前提下是有问题的，因此被视为不正确的选项。

ECX2953 - ECX5953 - S2 2025 ECX2953-ECX5953 期中考试 - 20%

如果需求曲线是线性的且向下倾斜，下列哪项不正确？

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