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Consumption of goods changes as income changes

This below figure demonstrates how consumption of goods A, B, C and D changes as a family’s income changes. When income increases, the income elasticity of demand is positive although declining for: (w) good A. (x) good B  (y) good C. (z) good D.

2057_Income Elasticity of Demand.png

How can I solve my economics problem? Please suggest me the correct answer.

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