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A consumer of a single commodity is in equilibrium when

A consumer of a single commodity is in equilibrium when

A.

He can equate his demand with price

B.

He equates marginal utility and price

C.

He can equate his marginal and total utilities

D.

His marginal utility is equal to zero

Correct answer is B

A consumer is in equilibrium when the marginal utility equal to the price of the commodity i.e MUx = Px.
Where : X = the commodity
MU = Marginal utility
P = price of the commodity
Therefore, a consumer who consume a single commodity such as apple will be at equilibrium when MUa = Pa