The demand curve for a product might shift as the result of a change in:

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All of these factors (consumer tastes, consumer incomes, and prices of related goods) can cause a shift in the demand curve for a product. If consumer tastes change, the demand for a product might increase or decrease. If consumer incomes increase, the demand for normal goods might increase while demand for inferior goods might decrease. If prices of related goods change (e.g. substitute goods or complementary goods), the demand for the product in question might increase or decrease as well.

The Demand Curve for a Product Might Shift as the Result