earned from providing one more halrcut $-$ curve is also downward sloping.

Cofi

If you are charging the same price to each of your clients, why is your marginal revenue curve downward sloping?

Because in order to sell one more haircut, I have to lower the price for that haircut AND all of the previous haircuts.

Because in order to sell one more haircut, I have to lower the price only for that haircut $($thankfully NOT all of the previous haircuts$).$

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