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March 12, 2026 

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DEPENDENT VARIABLE: A variable that is identified within the workings of the model. Also termed an endogenous variable, a dependent variable is in essence the "output" of the model. It should be compared with an exogenous variable this is the "input" of the model.

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4-FIRM CONCENTRATION RATIO: The proportion of total output in an industry that's produced by the four largest firms in the industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and how market control is held by the four largest firms in the industry.

     See also | concentration ratio | 8-firm concentration ratio | market share | market control | oligopoly | monopolistic competition |


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COMPENSATING WAGE DIFFERENTIALS

Different wages paid to different workers or in different markets that adjust for differences in the jobs or in the productivity of the workers. Wage differentials occur for many reasons. Quite often they are the result of the personal preferences of workers. In some cases workers are willing to "buy" leisure-time or other types of household production by taking lower wages. Differences in job risks, education, and location are also reasons for the persistence of wage differentials.

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