Business economics is a field in applied economics which uses economic theory and quantitative methods to analyze business enterprises and the factors contributing to the diversity of organizational structures and the relationships of firms with labour, capital and product markets. A professional focus of the journal Business Economics has been expressed as providing "practical information for people who apply economics in their jobs."Business economics is an integral part of traditional economics and is an extension of economic concepts to the real business situations. It is an applied science in the sense of a tool of managerial decision-making and forward planning by management. In other words, business economics is concerned with the application of economic theory to business management. Business economics is based on microeconomics in two categories: positive and normative. Business economics focuses on the economic issues and problems related to business organization, management, and strategy. Issues and problems include: an explanation of why corporate firms emerge and exist; why they expand: horizontally, vertically and spacially; the role of entrepreneurs and entrepreneurship; the significance of organizational structure; the relationship of firms with employees, providers of capital, customers, and government; and interactions between firms and the business environment.