5 Backward-bending labor supply curve 6 Ceiling price 7 Coase theorem 8 Contract curve 10 Price support 得分阅卷教师 二、简答题：（共10分） 1.Public goods are both nonrival and nonexclusive.Explain each of these terms and show clearly how they differ from each other. 5 Backward-bending labor supply curve 6 Ceiling price 7 Coase theorem 8 Contract curve 9 Diversifiable risk 10 Price support 二、简答题：（共 10 分） 1. Public goods are both nonrival and nonexclusive. Explain each of these terms and show clearly how they differ from each other. 得分 阅卷教师