The law of equi-marginal utility states the condition of equilibrium as
A. $$M{U_x},\,{P_x} = M{U_y},\,{P_y} = M{U_z},\,{P_z}$$
B. $$\frac{{M{U_x}}}{{{P_x}}} = \frac{{M{U_y}}}{{{P_y}}} = \frac{{M{U_z}}}{{{P_z}}} = M{U_m}$$
C. $$\frac{{M{U_x}}}{{{P_y}}} = \frac{{M{U_y}}}{{{P_x}}} = M{U_m}$$
D. $$\frac{{M{U_x}}}{{{P_x}}} < \frac{{M{U_y}}}{{{P_y}}} < \frac{{M{U_z}}}{{{P_z}}}$$
Answer: Option B

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