In deriving a demand curve for an individual product we invoke the ceteris paribus assumption which includes among other things that income remains fixed. Why can't we use that assumption when it comes to deriving the aggregate demand curve?

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The Answer of In deriving a demand curve for an individual product we invoke the ceteris paribus assumption which includes among other things that income remains fixed. Why can't we use that assumption when it comes to deriving the aggregate demand curve?

In Deriving a Demand Curve for an Individual Product We