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« Are Things More Unequal These Days? It Depends on How You Look at the Question | Main | Beer Launching Fridge »

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kb

Um, I think dU/d(cream) goes negative at relatively small quantities of cream, but dU/d(coffee) stays positive over much wider ranges. You don't actually MIND being wired like an electric company, do you?

spencer

You also have to look at the cost of having an employee pouring the coffee.

It would probably cost more to have an employee pour the cream then the cost of
any extra cream customers take.

Compare it to the self-serfice soft drink dispensers at many fast food places.
Customers are free to refill their container -- and many do just before they leave -- but having the customer do the work is still cheaper then having an employee doing it.

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