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Extension/contraction and shift in demand

Differentiate between extension/contraction and shift in demand?

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Comparison between extension/contraction and shift in demand are as given here:

Extension/Contraction of Demand:

  • Demand is varying because of changes within price
  • Other factors as preferences, taste and income and other remaining similar.
  • Consumer moves beside identical demand curve

Shift in Demand:

  • Demand is varying because of changes in other factors
  • Price of commodity remain similar
  • Consumer may shifts to higher/lower demand curve.

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