Explanation:

- Option 1: Macroeconomics

- Macroeconomics is indeed the branch of economics that deals with economic aggregates. It studies entire economies, considering factors such as GDP, national income, and inflation.

- Correct Answer

- Option 2: Microeconomics

- Microeconomics focuses on individual markets and agents like consumers and firms. It examines supply and demand, pricing, and resource allocation at a smaller scale.

- Option 3: Price Theory

- Price theory involves the analysis of how prices are determined in individual markets. It is a fundamental part of microeconomics.

- Option 4: Factor Price Determination

- This refers to the setting of wages and rent prices, mainly concerning the cost of factors of production, and is part of microeconomic analysis.