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精编密训教材，分阶快递。social cost-those costs which are incurred by the public,. Polluted waterways; those are costs not captured by the market
social benefits-those benefits which are realized by the public or outside the buyer/seller exchange
pure Private Good a good that has exclusion and distributive characteristics
Technological efficiency-the identification of those inputs that have the greatest effect on output per $ of input expenditure
Pareto Efficiency-the optimal point(efficient point) for society when any further improvement for some comes at the expense of others
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