Suppose the equation Qd=(10-0.4D)-0.6P describes an individual's demand for iTunes content, with D being the price of the device needed to access iTunes content, in $100s.
a) Draw the individual demand curve and show a person's quantity demanded when the price P is $8 and the price of the device is $600 (D=6).
b) If the market price P increased by $1 (so that the new price is P=$9), what should be the change in the price of the device (D) that would keep the quantity demanded the same as before? Show these changes in a graph.
c) For the above question (b), identify which change(s) have determined a movement along the demand curve, and which have determined a shift in the demand curve.

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The Answer of Suppose the equation Qd=(10-0.4D)-0.6P describes an individual's demand for iTunes content, with D being the price of the device needed to access iTunes content, in $100s.
a) Draw the individual demand curve and show a person's quantity demanded when the price P is $8 and the price of the device is $600 (D=6).
b) If the market price P increased by $1 (so that the new price is P=$9), what should be the change in the price of the device (D) that would keep the quantity demanded the same as before? Show these changes in a graph.
c) For the above question (b), identify which change(s) have determined a movement along the demand curve, and which have determined a shift in the demand curve.

Suppose the Equation Qd=(10-0