For many years, the price of personal computers has fallen and the quantity sold has risen

Subject:MarketingPrice:2.88 Bought3

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For many years, the price of personal computers has fallen and the quantity sold has risen. This can best be attributed to:

a) Improved technology which has caused supply to shift rightward,

b) Improved technology which has caused supply to shift leftward,

c) Greater popularity which has caused demand to shift rightward,

d) An increase in the number of computer users, which has caused demand to shift leftward.