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July 15, 2025 

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SECOND RULE OF SUBJECTIVITY: The second of seven basic rules of the economy. It is the notion that market prices are ultimately determined by subjective values and preferences of buyers and resource owners. While regular, everyday consumers are prone to accept the prices "set" by retail stores and other sellers as etched in stone (perhaps along with the Biblical ten commandments), such is not the case. The price of a product depends on two things, demand (especially the demand price that buyers are willing to pay) and supply (especially the supply price that sellers are willing to accept). Both, I repeat both, are subjectively determined. By subjective, I mean they are based on the values, beliefs, tastes, and preferences of people.

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MARGINAL COST: The change in total cost (or total variable cost) resulting from a change in the quantity of output produced by a firm in the short run. Marginal cost indicates how much total cost changes for a give change in the quantity of output. Because changes in total cost are matched by changes in total variable cost in the short run (remember total fixed cost is fixed), marginal cost is the change in either total cost or total variable cost. Marginal cost, usually abbreviated MC, is found by dividing the change in total cost (or total variable cost) by the change in output.

     See also | total cost | total variable cost | marginal cost curve | quantity | law of diminishing marginal returns | technology | resource prices | increasing marginal returns | decreasing marginal returns | U-shaped cost curves | average total cost | average variable cost | average fixed cost | total cost |


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ACCOUNTING COST

An actual outlay or expenses incurred in the production of a good that shows up in a firm's accounting statements and records. Accounting cost is an explicit payment (that is, money changing hands) incurred by a firm. Accounting cost, while very important to accountants, company CEOs, shareholders, and the Internal Revenue Service, is only minimally important to economists. The reason is that economists are more interested in economic cost (also called opportunity cost), which is the value of foregone production.

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Okun's Law posits that the unemployment rate increases by 1% for every 2% gap between real GDP and full-employment real GDP.
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