Note on Shifts in Demand and Supply Curves
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DESCRIPTIONS of the shifting of demand and supply curves frequently are confusing. Some authors use the words up and down, others vertical and horizontal, while still a third group prefers right and left. Recently one writer' attempted to prove that a shift of the demand curve to the right graphically is the same as a shift upward, but he apparently failed to perceive that the demonstration was necessarily limited to the special case of a negatively sloping straight line.2 Under this particular restriction, clearly a shift upward a shift to the right, a shift downward-=a shift to the left.