The firm's performance relative to competitors can be measured by the proportion of the market that the firm is able to capture. This proportion is referred to as the firm's market share and is calculated as follows:

Market Share    =    Firm's Sales  /  Total Market Sales

Sales may be determined on a value basis (sales price multiplied by volume) or on a unit basis (number of units shipped or number of customers served).

While the firm's own sales figures are readily available, total market sales are more difficult to determine. Usually, this information is available from trade associations and market research firms.

Reasons to Increase Market Share

Market share often is associated with profitability and thus many firms seek to increase their sales relative to competitors. Here are some specific reasons that a firm may seek to increase its market share:

• Economies of scale - higher volume can be instrumental in developing a cost advantage.

• Sales growth in a stagnant industry - when the industry is not growing, the firm still can grow its sales by increasing its market share.

• Reputation - market leaders have clout that they can use to their advantage.

• Increased bargaining power - a larger player has an advantage in negotiations with suppliers and channel members.

Ways to Increase Market Share

The market share of a product can be modeled as:

Share of Market  =  Share of Preference  x  Share of Voice  x  Share of Distribution

According to this model, there are three drivers of market share:

• Share of preference - can be increased through product, pricing, and promotional changes.

• Share of voice - the firm's proportion of total promotional expenditures in the market. Thus, share of voice can be increased by increasing advertising expenditures.

• Share of distribution - can be increased through more intensive distribution.

From these drivers we see that market share can be increased by changing the variables of the marketing mix.

• Product - the product attributes can be changed to provide more value to the customer, for example, by improving product quality.

• Price - if the price elasticity of demand is elastic (that is, > 1), a decrease in price will increase sales revenue. This tactic may not succeed if competitors are willing and able to meet any price cuts.

• Distribution - add new distribution channels or increase the intensity of distribution in each channel.

• Promotion - increasing advertising expenditures can increase market share, unless competitors respond with similar increases.

Reasons Not to Increase Market Share

An increase in market share is not always desirable. For example:

• If the firm is near its production capacity, an increase in market share might necessitate investment in additional capacity. If this capacity is underutilized, higher costs will result.

• Overall profits may decline if market share is gained by increasing promotional expenditures or by decreasing prices.

• A price war might be provoked if competitors attempt to regain their share by lowering prices.

• A small niche player may be tolerated if it captures only a small share of the market. If that share increases, a larger, more capable competitor may decide to enter the niche.

• Antitrust issues may arise if a firm dominates its market.

In some cases it may be advantageous to decrease market share. For example, if a firm is able to identify certain customers that are unprofitable, it may drop those customers and lose market share while improving profitability.

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