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September 20, 2018 

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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

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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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MARKET SHARE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: September 20, 2018].


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EXCHANGE RATE

The price of the currency of one country stated in terms of the currency of another country, that is, the rate of exchange of one currency for another. Exchange rates, also termed foreign exchange rates, are prices determined in foreign exchange markets that are set up to trade the currencies of different nations (foreign exchange). In general, exchange rates reflect the overall health, vitality, and productivity of a nation's economy. However, because exchange rates also affect international trade (exports and imports) among nations they are often subject to governmental policy control.

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