題目 1 · 選擇題
1 分A manufacturer of organic snacks notices that when the average consumer income in its target region rises from \(\$40,000\) to \(\$42,000\), the quantity demanded of its premium quinoa bars increases from 50,000 packs per month to 55,500 packs. What is the income elasticity of demand (YED) for the quinoa bars?
- A.+2.2
- B.+0.45
- C.-2.2
- D.+1.1
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解題
To calculate the income elasticity of demand (YED), we use the following steps:
1. Calculate the percentage change in quantity demanded:
\[ \% \Delta QD = \frac{55,500 - 50,000}{50,000} \times 100 = 11\% \]
2. Calculate the percentage change in income:
\[ \% \Delta Y = \frac{42,000 - 40,000}{40,000} \times 100 = 5\% \]
3. Calculate YED:
\[ YED = \frac{\% \Delta QD}{\% \Delta Y} = \frac{11\%}{5\%} = +2.2 \]
1. Calculate the percentage change in quantity demanded:
\[ \% \Delta QD = \frac{55,500 - 50,000}{50,000} \times 100 = 11\% \]
2. Calculate the percentage change in income:
\[ \% \Delta Y = \frac{42,000 - 40,000}{40,000} \times 100 = 5\% \]
3. Calculate YED:
\[ YED = \frac{\% \Delta QD}{\% \Delta Y} = \frac{11\%}{5\%} = +2.2 \]
評分準則
1 mark for the correct answer (A).
- Reject other choices as they represent incorrect applications of the formula or inverted steps.
- Reject other choices as they represent incorrect applications of the formula or inverted steps.