Microeconomics is a branch of economics that focuses on the behavior of individual economic units such as households, firms, and industries. It examines how these units make decisions regarding the allocation of resources and how their choices affect the overall economy. In contrast, macroeconomics studies the behavior of the economy as a whole, including variables such as national income, general price level, national saving, and investment.

Among the options given, factor pricing falls under the realm of microeconomics.

Explanation:
- Definition of factor pricing: Factor pricing refers to the determination of prices for factors of production, such as labor, capital, land, and entrepreneurship. It examines how these factors are bought and sold in the market and how their prices are determined.
- Factors of production: Factors of production are the resources used in the production process. Labor refers to the human effort involved, capital represents the physical and financial resources, land includes natural resources, and entrepreneurship refers to the organization and coordination of these factors.
- Individual decision-making: Factor pricing involves analyzing the decisions made by individuals and firms in the market for factors of production. For example, firms decide how much labor to hire and at what wage rate, while individuals decide how much labor to supply and at what wage rate they are willing to work.
- Supply and demand: The determination of factor prices is influenced by the forces of supply and demand. The supply of factors is determined by the willingness of individuals and firms to provide them, while the demand for factors is determined by the productivity and profitability of using these factors in production.
- Market equilibrium: In a competitive market for factors of production, the interaction of supply and demand determines the equilibrium price and quantity. The equilibrium price represents the market-clearing price at which the quantity supplied equals the quantity demanded.
- Market imperfections: Factor pricing also considers market imperfections, such as monopoly power, labor unions, and government regulations, which can distort the determination of factor prices.
- Microeconomic analysis: By examining factor pricing, microeconomics provides insights into how individual decisions and market forces shape the allocation of resources and the distribution of income in the economy.

In summary, factor pricing falls under microeconomics because it focuses on the behavior of individual economic units, the determination of prices for factors of production, and the analysis of supply and demand in factor markets.