Marginal external benefit is a. the benefit from an additional unit of a good or service that people other than the consumer of that good or service receives b. the marginal benefit enjoyed by everyone who receives a benefit from the good or service c. the benefit from an additional unit of a good or service that the consumer of that good or service receives d. the benefit from a good or service that someone other than the consumer of that good or service receives what is the relationship between marginal social benefit, marginal private benefit, and marginal external benefit? a. marginal external benefitminusmb = msb b. msb minus marginal external benefit = mb c. msb + marginal external benefit = mb d. mbminus marginal external benefit = msb