Question

The concept of elasticity of demand was introduced by
a. Ferguson
b. Keynes
c. Adam Smith
d. Marshall

Answer 1

Ans-

D) Marshall

Marshall the concept of elasticity in 1890 to measure the magnitude of percentage change in the quantity demanded of a commodity to a certain percentage change in its price or the income of the buyer or in the prices of related goods.

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Answer 2

the concept of elasticity of demand was given by prof. MARSHALL.
so answer is (D)