How do economists define marginal benefit for an individual

Marginal benefit and marginal cost are two measures of how the cost or value of a product changes. ... A marginal benefit is the maximum amount of money a consumer is willing to pay for an additional good or service. The consumer's satisfaction tends to decrease as consumption increases.

Explanation:

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answer; ///i believe the correct answer is (c) laissez-faire;

answer; ///i believe the correct answer is(e) complementary to each other;