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TR: The abbreviation for total revenue, which is the revenue received by a firm for the sale of its output. Total revenue is one of two parts a firm needs for the calculation of economic profit, the other is total cost. In general, total revenue is the price received for selling a good times the quantity of the good sold at that price. For a perfectly competitive firm, which receives a single unchanging price for all output sold, the calculation is relatively easy. For other real world firms, that charge different prices to different buyers for different quantities, the calculation can be more complex.

Total revenue is very important in the analysis a firm's short-run production decision. Two other revenue measures directly related to total cost are average revenue and marginal revenue. Total revenue is often depicting as the total revenue curve. For a perfectly competitive firm, the total revenue curve is a straight line from the origin. For a monopoly, oligopoly, or monopolistically competitive firm, the total revenue curve is "hump-shaped," increasing at a decreasing rate, reaching a peak, then declining.

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FIXED INPUT

An input whose quantity cannot be changed in the time period under consideration. The relevant time period is usually termed the short run. The most common example of a fixed input is capital. The alternative to fixed input is variable input. A fixed input, such as capital, provides the "capacity" constraint for the short-run production of a firm. A variable input, such as labor, provides the means of changing short-run production. As larger quantities of a variable input are added to a fixed input, the variable input becomes less productive, which is the law of diminishing marginal returns.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers looking to buy either a cross-cut paper shredder or a birthday greeting card for your father. Be on the lookout for the last item on a shelf.
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A scripophilist is one who collects rare stock and bond certificates, usually from extinct companies.
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