If we graph marginal utility, the curve has a negative slope.This is because of the

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The negative slope of the marginal utility curve is due to the law of diminishing marginal utility, which states that as one consumes more and more of a good or service, the additional satisfaction or utility derived from each additional unit consumed decreases. This leads to a downward-sloping marginal utility curve. The other choices, such as the optimal purchase rule and marginal rate of substitution, can also impact consumer behavior, but they do not directly explain the negative slope of the marginal utility curve.

If We Graph Marginal Utility, the Curve Has a Negative