Microeconomics 14th Edition by James Gwartney ,Richard Stroup,Russell Sobel ,David Macpherson

Exercise 5

When residential electricity in the state of Washington cost about half as much as in nearby Montana, the average household in Washington used about 1,200 kilowatthours per month, whereas Montanans used about half that much per household. Do these data provide us with two points on the average household's demand curve for residential electricity in this region? Why or why not?