The income elasticity of demand for store brands of soda (that is, non-name brands) is negative. What does this fact indicate about consumers' perceptions about the store brands?

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The Answer of The income elasticity of demand for store brands of soda (that is, non-name brands) is negative. What does this fact indicate about consumers' perceptions about the store brands?

The Income Elasticity of Demand for Store Brands of Soda