Income elasticity is computed by
A. $${e_i} = \frac{{{Y_2} - {Y_1}}}{{{e_1}}}$$
B. $${e_i} = \frac{{{Y_1} - {Y_2}}}{{{P_1}}}$$
C. $${e_i} = \frac{{\frac{{{Q_2} - {Q_1}}}{{{Q_1}}}}}{{\frac{{{Y_2} - {Y_1}}}{{{Y_1}}}}}$$
D. $${e_i} = \frac{{{Q_2} - {Q_1}}}{{{P_1}}}$$
Answer: Option C
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