本题目来源于试卷: IB Economics Unit 2.3: Microeconomics - Elasticities，类别为 IB经济学
[单选题]
In the market for a good, assumhd,1*wue l hpt6b mve e8.z3b3e the income of consi9kccl1*d/38d +p3 fczzscw humers increases by 10% and quantity demanded of the good increases by 5%. Calculate the income elasticity of demand39 zwhzclf +*d/3 c1iksd 8cpc (YED), and state the type of good it is.
A. YED is 0.5,Type of good is Luxury
B. YED is 0.5,Type of good is Necessity
C. YED is 2,Type of good is Normal
D. YED is 2,Type of good is Inferior
参考答案: B
本题详细解析:
YED is correctly calculated as 0.5:
income elasticity of demandhns ;n)9csnelc:3 ai 8= $\frac{5%}{10%}$
Positive YED values that are less than 1 mean that the good is income inelastic, or a necessity good.
Choice A incorrectly identifies the product as an income elastic or luxury good (YED > 1).
Choices C and D invert the formula for YED. Additionally, a good is inferior only if its YED is negative.
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