If the marginal utility of commodity is equal to its price, then

To understand the concept of marginal utility and price, let's delve into a simple explanation. Marginal utility refers to the additional satisfaction or utility that a consumer gains from consuming one more unit of a good or service. Meanwhile, the price of a commodity is what the consumer pays to acquire that good or service.

In economic terms, a consumer is said to be in equilibrium when they have allocated their resources in such a way that they get the most satisfaction or utility from their consumption. The consumer equilibrium condition is achieved when the marginal utility per unit of expenditure is the same for all commodities.

Therefore, when the marginal utility of a commodity is equal to its price, it means the consumer is maximizing their satisfaction with the resources available. The consumer has no incentive to change the consumption bundle because they are already getting the highest possible satisfaction. In other words, the consumer is getting just as much utility from the last unit of the good as it costs. Consequently, the consumer is in equilibrium.

Thus, the correct explanation is: The consumer is in equilibrium.