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](https://secure.tutorsglobe.com/CMSImages/2057_Income%20Elasticity%20of%20Demand.png)
How can I solve my economics problem? Please suggest me the correct answer.