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What may cause a leftward shift of the supply curve?

  • A.A decrease in the cost of production for the firm
  • B.An increase in the number of sellers in the industry
  • C.An improvement in technology
  • D.The imposition of an excise duty on a commodity

Answer: D

A leftward shift of the supply curve means that less is offered at every price, which happens when production becomes costlier or less profitable. An excise duty raises the cost of selling each unit, so the supply curve shifts to the left. A fall in the cost of production, a rise in the number of sellers and an improvement in technology all raise supply at each price and shift the curve to the right. The answer is the imposition of an excise duty on a commodity, option D.

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