March 23, 2018 

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INCOME ELASTICITY OF DEMAND: The relative response of a change in demand to a relative change in income. More specifically the income elasticity of demand can be defined as the percentage change in demand due to a percentage change in buyers' income. The income elasticity of demand quantitatively identifies the theoretical relationship between income and demand.

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MARKET SHARE: The fraction of an industry's total sales accounted for by a single business. In general, market share is a "first-guess" indicator of a firm's market control. If, for example, a company has a market share of 100 percent (that is, a monopoly), then you can rest assured it has a substantial amount of market control. A company with a 25 percent market share has less, but still notable, market control. In fact, when you get right down to the bottom line, the phrase "market share" is only worth mentioning for oligopolistic firms with a significant degree of market control. There really is no market control for a monopolistically competitive firm with a 0.00000001 percent market share.

     See also | market | market control | imperfect competition | oligopoly | monopolistic competition | concentration ratio |

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A curve that graphically represents the relation between total factor cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. The total factor cost curve is most important in factor market analysis for the derivation of the marginal factor cost curve.

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