When a consumer increased units of X commodity by giving up some units of Y commodity and even to attain the same level of satisfaction, the marginal rate of substitution will be calculated by
A. $$\frac{{{\text{Change}}\,{\text{in X commodity}}}}{{{\text{Marginal utility}}\,{\text{of Y commodity}}}}$$
B. $$\frac{{{\text{Change}}\,{\text{in Y commodity}}}}{{{\text{Marginal utility}}\,{\text{of X commodity}}}}$$
C. $$\frac{{{\text{Change}}\,{\text{in X commodity}}}}{{{\text{Change}}\,{\text{in Y commodity}}}}$$
D. $$\frac{{{\text{Change}}\,{\text{in Y commodity}}}}{{{\text{Change}}\,{\text{in X commodity}}}}$$
Answer: Option D

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