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Option AJeromehas a beautiful well-kept front garden with many colorful flowers. A well-maintained lawn creates anexternalityA well-maintained lawn exists relative to asocially efficientcrowd.Socially efficientprices and quantities are those that occur in a perfectly competitive market. This occurs when the marginal cost equals the demand, at price B and quantity Y. This means that all possible mutual benefit deals could have been made.This is the optimal allocation of resources in society, taking into account all external andinternal costsand benefits.Social efficiencyoccurs at outputs where marginal social utility (MSB) = marginal social cost (MSC).Learn more aboutSocial efficiencyherebrainly.com/question/28444760#SPJ4...