March 17, 2018 

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VARIABLE: A quantity, usually represented as a symbol, that can take on one of a set of values. Variables play a key role in the scientific method and economic analysis. A major task undertaken by the study of economics is to identify the specific value of variables such as price, quantity, unemployment, production, wages, income, among a host of others. This often accomplished using assorted models, such as the market model.

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SEVEN RULES: Seven key economic principles underlying the study of economics and the operation of the economy. These seven rules are: first -- scarcity, second -- subjectivity, third -- inequality, fourth -- competition, fifth -- imperfection, sixth -- ignorance, and seventh -- complexity.

     See also | first rule of scarcity | second rule of subjectivity | third rule of inequality | fourth rule of competition | fifth rule of imperfection | sixth rule of ignorance | seventh rule of complexity |

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A perfectly competitive firm produces the profit-maximizing quantity of output that equates marginal revenue and marginal cost. This production level can be identified using total revenue and cost, marginal revenue and cost, or profit. Because a perfectly competitive firm faces a perfectly elastic demand curve, it efficiently allocates resources by equating price and marginal cost. In addition, the marginal cost curve above the average variable cost curve is the perfectly competitive firm's short-run supply curve.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a New York Yankees baseball cap or several magazines on home repairs. Be on the lookout for cardboard boxes.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
"If football taught me anything about business, it is that you win the game one play at a time."

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