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Other things remaining constant, if a competitor of commodity X carries out a successful advertisement campaign, the demand curve for X shall ................... .

  • A.Shift to the left
  • B.Shift to the right
  • C.Become positively sloping
  • D.Become parallel to Y axis

Answer: A

The demand curve for X shall shift to the left.

A successful advertisement campaign by a competitor draws buyers towards the rival product, so at every price fewer units of X are demanded. A fall in demand at every price is shown by a leftward shift of the whole demand curve. Its own price has not changed, so this is not a movement along the curve.

A rightward shift would mean higher demand for X. The demand curve does not become positively sloping or vertical because of a rival's advertising; its slope reflects the law of demand.

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