Gina changes the amount of milk she purchases depending on whether it costs $1,$1.50, or $1.75 a pound. What other information do we need to come up with her demand curve for milk?
Select the correct answer below:


whether her milk consumption goes up or down with price

how much milk she buys in total

whether or not she switches to a substitute when the price is high

how much milk she buys at each price point



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