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market sharethe proportion of total sales of a product accounted for by an individual BRAND of the product or all brands of the product offered by a firm in a particular MARKET.
A firm's market share relative to competitors' market share provides an indicator of its success in marketing its brand(s) over time. Some minimum market share may be necessary to achieve sufficient sales volume to enable the firm to produce efficiently (see ECONOMIES OF SCALE). Beyond this the firm may aspire to market leadership of the whole market or may seek to achieve high market share in one or more MARKET SEGMENTS.
Market shares can be only meaningfully related to a precise definition of the market serviced by the firm both in geographic terms (for example UK snack product sales or European snack product sales), and in product scope (for example, potato crisps and other snack products). See MARKET LEADER, MARKET CHALLENGERS, MARKET CONCENTRATION, COMPETITION POLICY.