A product demand curve and the aggregate demand curve are negatively sloped for the same reasons.

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A product demand curve is negatively sloped primarily due to the substitution and income effects, where consumers buy less of a product as its price rises, substituting it with cheaper alternatives or because their purchasing power decreases. The aggregate demand curve, on the other hand, is negatively sloped due to different reasons such as the wealth effect, interest rate effect, and the exchange rate effect, which influence overall spending in the economy as price levels change.

A Product Demand Curve and the Aggregate Demand Curve Are