The market structure of an economy is mainly judged by the market concentration of firms. It measures the monopoly power of the firms in the industry. A market may be viewed as a means of processing the revealed preference of all the buyers and sellers and disseminating signals in the form of price incentives.Global market plays a very important role in the economic growth of a country. It not only helps us in disposing off the excess supply of goods and services, but also provides the opportunity to consume the goods and service, which the country is not able to produce.Thus, globalization is vied in terms of market expansion for both domestic and foreign companies. Such expansion creates a fair competition in the economy. The World Trade Organization is developed to promote competition among member countries for better economic growth of its members. Technological advancement, particularly of the late 20th century is also forcing companies to expand economies of scale to reduce the cost of production. All these forces are changing the market structure in almost all the economics.

However, the impact is not uniform. Developed countries might get more advantage compared to less developed countries, because of the existence of higher degree of competition in their industries. Indian economy is also experiencing lot of structural change after globalization. Many sectors are now opened for private participation even in public sector units.The market structure is mainly judged by the market concentration of firms. It measures the monopoly power of the firms in the industry. High degree of monopoly power indicates low degree of competition among the firms of the industry. Competition among the firms can ensure economic efficiency through optimum use of resources. Lack of demand in the less developed economies or their early phases of economic growth, induces market concentration in the hands of a few firms of the industry. Under such circumstances, the government does some intervention to control such monopolies.