. • thinking at the margin: the process of deciding how much more or less to do • cost/benefit analysis: a decision-making process in which you compare what you will sacrifice and gain by a specific action • marginal cost: the extra cost of adding a unit Chapter 2: Economic Systems and Decision Making Chapter 3: Business Organizations Chapter 4: Demand Chapter 5: Supply Chapter 6: Prices and Decision Making Chapter 7: Market Structures Chapter 8: Employment, Labor and Wages Chapter 9: Sources of Government Revenue Chapter 10: Government Spending Access answers to thousands of economics questions explained in a way that's very easy for you to understand. - Page 13 1.1 including work step by step written by community members like you. Rather, a theory is a tool for determining the answer. 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