Specifically, a deadweight loss is the loss in efficiency that a society suffers as a result of firms setting their monopoly prices greater than marginal cost, P > MC. The deadweight loss is due to the loss in value to society of output not produced. | Specifically, a deadweight loss is the loss in efficiency that a society suffers as a result of firms setting their monopoly prices greater than marginal cost, P > MC. The deadweight loss is due to the loss in value to society of output not produced. |