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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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REFERENCE WEEK, CURRENT POPULATION SURVEY

The calendar week (Sunday through Saturday) containing the 12th day of the month, which is used in the Current Population Survey (CPS) as the time period for documenting the employment and labor force status of respondents. The estimation of the unemployment rate and other employment information generated by the CPS are based on activities of survey respondents during this week. The actual survey is conducted by interviewers working for the Bureau of the Census during the calendar week containing the 19th day, which is termed the survey week.

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Today, you are likely to spend a great deal of time strolling through a department store seeking to buy either a set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for pencil sharpeners with an attitude.
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