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Top30学校通常要求3门以上AP成绩 报考不同专业可选的科目不同
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精编密训教材,分阶快递。Quasi-Public Goods-goods which have some limited private good characteristics such as congestible public goods and price-excludable public goods
Market failure-occurs when resources are not allocated optimally. It may result from: externality, imperfect completion, public goods, imperfect information;
Imperfect information-buyers and/or sellers do not have full knowledge about available markets,prices,products,customers,suppliers and so forth.
Nonrival-one person’s consumption of that good does not affect its consumption by others
Nonexcludable-goods cannot be held back from those who desire access.
Poverty line-the official benchmark of poverty