Watch LaterAdded 06:31 Scarcity and rivalry | Basic Economic Concepts | Microeconomics | Khan Academy
Watch LaterAdded 06:49 Production Possibilities Curve as a model of a country’s economy | AP Macroeconomics | Khan Academy
Watch LaterAdded 06:16 Changes in equilibrium price and quantity when supply and demand change | Khan Academy
Watch LaterAdded 06:15 Change in supply versus change in quantity supplied | AP Macroeconomics | Khan Academy
Watch LaterAdded 08:27 Change in demand versus change in quantity demanded | AP Macroeconomics | Khan Academy
Watch LaterAdded 08:51 Input approach to determining comparative advantage | AP Macroeconomics | Khan Academy
經濟學入門KHA Opportunity Cost Opportunity cost (and marginal cost) based on the PPF More free lessons at: http://www.khanacademy.org/video?v=pkEiHZAtoro
