March 23, 2018 

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AGGREGATE SUPPLY SHIFTS: Changes in the aggregate supply determinants can shift either the short-run aggregate supply curve and the long-run aggregate supply curve. The mechanism is comparable to that for market supply determinants and market supply. We have two options -- an increase in aggregate supply and a decrease in aggregate supply. An increase in resource quantity or quality or a decrease in resource prices shift the aggregate supply curves to right. A decrease in resource quantity or quality or an increase in resource prices shift the aggregate supply curves to left.

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IMPLICIT OPPORTUNITY COST: An opportunity cost that does NOT involve a money payment or a market transaction. This should be contrasted with explicit cost that DOES involve a money payment or a market transaction. The common misconception among non-economists out there in the real world is that the term "cost" is synonymous with the term "payment," that is, all costs are explicit costs, to be a cost you have to give up some money. Well, I'm here to tell you that this isn't true. Cost is opportunity cost. It's the satisfaction NOT received from activities NOT pursued. It's the value of foregone production. And not all opportunity costs involve a money payment.

     See also | opportunity cost | money | market | explicit cost | normal profit | accounting cost | economic cost | scarcity |

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An initial condition or statement of a model or theory that sets the stage for an analysis by abstracting from the real world. Assumptions are important to economic analysis. Some assumptions are used to simplify a complex analysis into more easily manageable parts. Other assumptions are used as control conditions that are subsequently changed to evaluate the consequences.

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