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Answer: Distinguish between Perfectly elastic demand and Perfectly inelastic demand

PointsPerfectly elastic demandPerfectly inelastic demand
MeaningA very small (or no) change in price causes an infinite change in quantity demanded.Quantity demanded does not change at all whatever the change in price.
Coefficient\(E_d = \infty\)\(E_d = 0\)
Demand curveHorizontal straight line parallel to the X-axis.Vertical straight line parallel to the Y-axis.
NatureTheoretical (imaginary) concept.Theoretical; approximately seen for essential goods like salt and life-saving drugs.
Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report
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