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TOTAL PRODUCT CURVE: A curve that graphically represents the relation between total production by a firm in the short run and the quantity of a variable input added to a fixed input. When constructing this curve, it is assumed that total product changes from changes in the quantity of a variable input like labor, while we hold one or more other inputs, like capital, fixed. A more general mathematical concept capturing the relation between total product and it's assorted inputs, both variable and fixed, can be found in production function.

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SUBSTITUTE: In terms of demand (that is, substitute-in-consumption), one of two goods that replace each other in consumption such that an increase in the price of one good leads to an increase in demand and a rightward shift in the demand curve for the other good. If the demand of good 1 increases as the price of good 2 increases, the goods are substitutes-in-consumption. In terms of supply (that is, substitute-in-production), one of two goods that replace each other in either producing using the same resources in an either/or fashion, such that an increase in the price of one good leads to a decrease in supply and a leftward shift in the supply curve for the other good. If the supply of good 1 decreases as the price of good 2 increases, the goods are substitutes-in-production.

     See also | demand | supply | substitute-in-consumption | substitute-in-production | consumption | production | demand curve | supply curve | demand determinants | supply determinants | demand shock | supply shock | comparative statics | elasticity |


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BARRIERS TO ENTRY

Institutional, government, technological, or economic restrictions on the entry of participants into a market or industry. The four primary barriers to entry are: (1) resource ownership, (2) patents and copyrights, (3) government restrictions, and (2) start-up cost. Barriers to entry are a key reason for market control and the inefficiency that results. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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