An economic system is the system of production, distribution and consumption of goods and services of an economy. Alternatively, it is the set of of principles and techniques by which problems of economics are addressed, such as the economic problem of scarcity through allocation of finite productive resources. The economic system is composed of people and institutions, including their relationships to productive resources, such as through the convention of property. Examples of contemporary economic systems include capitalist systems, socialist systems, and mixed economies. Economic systems is the economics category that includes the study of respective systems.