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Which opportunity would you choose？; Opportunity cost;2.People face tradeoffs.;2. People face tradeoffs.;2. People face tradeoffs.;3. The cost of something is what you give up to get it.;3. The cost of something is what you give up to get it ;3. The Cost of Something Is What You Give Up to Get It.;Example;*;Have all costs been fully taken into account?;Profit calculation;*;Scarcity and Choice for Individuals;Conclusions;Opportunity Cost, an example:;Opportunity Cost, an example:;3、;For an economist, ;Opportunity Costs: Community College and the Economic Downturn;Interdependence and the Gains from Trade ;Interdependence and Trade;??互依存与贸易;;;;;;;;Why is interdependence the norm? 为什么相互依存是正常的? ;What determines the pattern of production and trade? 什么决定生产和贸易？;;Comparative advantage: the basis fo