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Please can I have help with this economics question

The income elasticity of demand for fresh potatoes has been estimated to be -0.32. This means that the demand for fresh potatoes will
A) fall by 3.2% if incomes rise by 10%
B) rise by 3.2% if incomes rise by 10%
C) fall by 3.2% if price rises by 10%
D) rise by 3.2% if the price rises by 10%
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Original post by hbos14
The income elasticity of demand for fresh potatoes has been estimated to be -0.32. This means that the demand for fresh potatoes will
A) fall by 3.2% if incomes rise by 10%
B) rise by 3.2% if incomes rise by 10%
C) fall by 3.2% if price rises by 10%
D) rise by 3.2% if the price rises by 10%


YED is the % change in quantity demanded divided by the % change in income, so it is the gradient of the demand curve when the axes are income against quantity. Negative YED means the potatoes are an inferior good. You could just calculate the YED for each one and see which one is correct,

For B %ΔQD%ΔY=3.210=0.32\frac{\%\Delta QD}{\%\Delta Y} = \frac{3.2}{10} = 0.32, well that's not it, so do the same for the other options and find the one that has a YED of -0.32.

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