Step 1: Understanding the Concept:
Economics is broadly categorized into two major fields: Microeconomics and Macroeconomics. The distinction lies in the "level of aggregation." Microeconomics, derived from the Greek word "mikros" (meaning small), is the study of specific, individual parts of the economy. It examines how individual decision-making units—such as households and business firms—allocate their limited resources and how they interact in specific markets for goods and services.
Step 2: Detailed Explanation:
The scope of Microeconomics is centered around "Price Theory." It seeks to explain:
1. Theory of Consumer Behavior: How an individual consumer decides to spend their income among various goods to achieve maximum satisfaction (utility). Concepts like Law of Demand, Elasticity, and Indifference Curves fall here.
2. Theory of Producer Behavior: How a firm decides the combination of inputs (labor, capital) to use and what quantity of output to produce to maximize its profits. Concepts like Law of Supply, Production Functions, and Cost Analysis are studied here.
3. Price Determination: How the interaction of demand and supply determines the equilibrium price and quantity in different market structures like Perfect Competition, Monopoly, or Oligopoly.
4. Factor Pricing: How the prices of productive resources (rent for land, wages for labor, interest for capital) are determined.
By contrast, Macroeconomics deals with the economy as a whole.
- National Income (Option A): This is the sum total of all production, an aggregate measure.
- Economic Growth (Option C): This refers to the long-term increase in the total capacity of the nation's economy.
- Balance of Payments (Option D): This involves the entire nation's transactions with the rest of the world.
Step 3: Final Answer:
While Macroeconomics looks at the "forest" (the whole economy), Microeconomics looks at the "individual trees" (consumers and firms), making Option B the correct focus.