A consumer is in equilibrium when marginal utilities are :

Question

Accepted Answer

A consumer is in equilibrium when marginal utilities are equal. This concept is rooted in the theory of consumer behavior in economics, specifically the law of equi-marginal utility. According to this principle, a consumer achieves maximum satisfaction or utility when the marginal utility per unit of currency spent on each good or service is equal. This means that the consumer allocates their resources in such a way that the last unit of currency spent on each product provides the same level of additional satisfaction or utility.

### Explanation for Option 2: Equal
- **Justification**: The condition of equal marginal utilities ensures that the consumer is maximizing their total utility given their budget constraint. When the marginal utility per unit of currency is equal across all goods, reallocating expenditure from one good to another would not increase overall satisfaction. Therefore, the consumer is in equilibrium, having optimized their consumption choices.

### Explanation for Why Other Options are Incorrect

1. **Option 1: Minimum**
   - **Reason for Incorrectness**: If marginal utilities were at a minimum, it would imply that the consumer is not deriving significant additional satisfaction from consuming more of any good. This would not be an equilibrium state, as the consumer could potentially increase their total utility by reallocating their spending to goods with higher marginal utilities.

2. **Option 3: Highest**
   - **Reason for Incorrectness**: If marginal utilities were at their highest, it would suggest that the consumer has not yet reached an optimal allocation of resources. In such a scenario, the consumer could still increase their total utility by purchasing more of the goods with high marginal utility until the marginal utilities equalize.

3. **Option 4: Increasing**
   - **Reason for Incorrectness**: If marginal utilities are increasing, it indicates that the consumer is not consuming enough of a particular good. The consumer can increase their total utility by consuming more of the good with increasing marginal utility until it equalizes with the marginal utilities of other goods.

In conclusion, the correct answer is Option 2: Equal, because it reflects the condition under which a consumer achieves equilibrium by maximizing their total utility given their budget constraints.