Economists study society's structure, with particular emphasis on its organizations designed to facilitate the performance of the ordinary tasks of life. They are interested, in other words, in the methods of motivations for the financing, production, distribution and consumption of material goods and services. They describe and analyze the organizations of industries, the makeup and organization of the labor force, the money, banking and credit structure, international trade, finance and investment, the size, structure and distribution of the national product or income, and the use and conservation of natural resources. They also study the effects of movements and growth of population, the conditions for economic growth and development, and ways to expand trade and raise living standards.