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HERFINDAHL INDEX: A measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

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AVERAGE-MARGINAL RULE: An intriguing, extremely useful mathematical relationship between an average measure and it's corresponding marginal measure, for example average product and marginal product, or average total cost and marginal cost. When the marginal measure is greater than the average measure, then the average measure increases. Alternatively, when the marginal measure is less than the average measure, then the average measure decreases. In addition, when the marginal measure is equal to the average measure the average measure doesn't change.

     See also | average product | marginal product | average total cost | average variable cost | marginal cost | average revenue | marginal revenue | average factor cost | marginal factor cost | average revenue product | marginal revenue product |


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FACTOR DEMAND

The willingness and ability of productive activities (usually, business firms) to hire or employ factors of production. Factor demand relates factor price and factor quantity, specifically, it is the range of factor quantities that are demanded at a range of factor prices. This is one half of the factor market. The other half is factor supply. The factors of production subject to factor demand include any and all of the four scarce resources--labor, capital, land, and entrepreneurship. However, because labor involves human beings directly, it is the factor that tends to receive the most scrutiny and analysis.

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