market share

The proportion of a market taken by one producer. Market share can be measured in terms of volume of sales: for example, company X sold 40% of the cars sold last month in the UK market. Or it can be measured as the value of sales: for example, company X sold 30% of the total value of all cars sold in the UK market last month. Or it could be measured in terms of output by volume or value. For example, company X could have produced 50% of all the cars made in the UK even though its UK market share was 30% because it exported cars to other markets while some cars sold in the UK were produced in other countries.