- Market share
Market share is the percentage of a market (defined in terms of either units or revenue) accounted for by a specific entity. In a survey of nearly 200 senior marketing managers, 67 percent responded that they found the "dollar market share" metric very useful, while 61% found "unit market share" very useful.
Marketers need to be able to translate sales targets into market share because this will demonstrate whether forecasts are to be attained by growing with the market or by capturing share from competitors. The latter will almost always be more difficult to achieve. Market share is closely monitored for signs of change in the competitive landscape, and it frequently drives strategic or tactical action. 
Increasing market share is one of the most important objectives of business. The main advantage of using market share as a measure of business performance is that it is less dependent upon macroenvironmental variables such as the state of the economy or changes in tax policy. However, increasing market share may be dangerous for makers of fungible hazardous products, particularly products sold into the United States market, where they may be subject to market share liability.
Market share is a key indicator of market competitiveness—that is, how well a firm is doing against its competitors. This metric, supplemented by changes in sales revenue, helps managers evaluate both primary and selective demand in their market. That is, it enables them to judge not only total market growth or decline but also trends in customers’ selections among competitors. Generally, sales growth resulting from primary demand (total market growth) is less costly and more profitable than that achieved by capturing share from competitors. Conversely, losses in market share can signal serious long-term problems that require strategic adjustments. Firms with market shares below a certain level may not be viable. Similarly, within a firm’s product line, market share trends for individual products are considered early indicators of future opportunities or problems. 
It is generally necessary to commission market research (generally desk/secondary research) to determine. Sometimes, though, one can use primary research to estimate the total market size and a company's market share.
Market share: The percentage of a market accounted for by a specific entity. 
Unit market share: The units sold by a particular company as a percentage of total market sales, measured in the same units. 
- Unit market share (%) = 100 * Unit sales (#) / Total Market Unit Sales (#)
This formula, of course, can be rearranged to derive either unit sales or total market unit sales from the other two variables, as illustrated in the following:
- Unit sales (#) = Unit market share (%) * Total Market Unit Sales (#) / 100
- Total Market Unit Sales (#) = 100 * Unit sales (#) / Unit market share (%)
Revenue market share: Revenue market share differs from unit market share in that it reflects the prices at which goods are sold. In fact, a relatively simple way to calculate relative price is to divide revenue market share by unit market share. 
- Revenue market share (%) = 100 * Sales Revenue ($) / Total Market Sales Revenue($)
As with the unit market share, this equation for revenue market share can be rearranged to calculate either sales revenue or total market sales revenue from the other two variables.
Although market share is probably the single most important marketing metric, there is no generally acknowledged best method for calculating it. This is unfortunate, as different methods may yield not only different computations of market share at a given moment, but also widely divergent trends over time. The reasons for these disparities include variations in the lenses through which share is viewed (units versus dollars), where in the channel the measurements are taken (shipments from manufacturers versus consumer purchases), market definition (scope of the competitive universe) and measurement error. 
- ^ a b c d e f g h Farris, Paul W.; Neil T. Bendle; Phillip E. Pfeifer; David J. Reibstein (2010). Marketing Metrics: The Definitive Guide to Measuring Marketing Performance. Upper Saddle River, New Jersey: Pearson Education, Inc. ISBN 0137058292. The Marketing Accountability Standards Board (MASB) endorses the definitions, purposes, and constructs of classes of measures that appear in Marketing Metrics as part of its ongoing Common Language: Marketing Activities and Metrics Project.
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Look at other dictionaries:
market share — n: the percentage of the market for a product or service that a company supplies Merriam Webster’s Dictionary of Law. Merriam Webster. 1996. market share … Law dictionary
market share — market shares N VAR: oft with poss A company s market share in a product is the proportion of the total sales of that product that is produced by that company. [TECHNICAL] Ford has been gaining market share this year at the expense of GM and some … English dictionary
market share — n [U and C] the ↑percentage of sales in a ↑market that a company or product has … Dictionary of contemporary English
market share — noun count or uncount BUSINESS * the percentage of the total amount of sales of a particular product that a company has … Usage of the words and phrases in modern English
market share — n. the percentage of the total sales of some commodity accounted for by a given company … English World dictionary
Market Share — Dissemination of market share and ranking information to member firms. London Stock Exchange Glossary * * * market share market share ➔ Share * * * market share UK US noun [C or U] MARKETING, COMMERCE ► the number of products or services that a… … Financial and business terms
market share — The percentage of total industry sales that a particular company controls. Bloomberg Financial Dictionary * * * market share market share ➔ Share * * * market share UK US noun [C or U] MARKETING, COMMERCE … Financial and business terms
Market Share — The percentage of an industry or market s total sales that is earned by a particular company over a specified time period. Market share is calculated by taking the company s sales over the period and dividing it by the total sales of the industry … Investment dictionary
market share — Econ. the specific percentage of total industry sales of a particular product achieved by a single company in a given period of time. * * * noun, pl ⋯ shares : the percentage that a company has of the total sales for a particular product or… … Useful english dictionary
market share */ — UK / US noun [countable/uncountable] Word forms market share : singular market share plural market shares business the percentage of the total amount of sales of a particular product that a company has … English dictionary