Introduction to Microeconomics

The Economic Problem: The problem of choice arising because human wants are unlimited, but resources available to satisfy those wants are strictly scarce and possess alternative uses.

The 3 Central Problems of an Economy:

1. 1. What to Produce and in What Quantities?

   Deciding which goods and services to produce and in what exact volumes:

   • Consumer Goods vs Capital Goods: Producing food/clothing vs machines/factories.
   • War Goods vs Civilian Goods: "Guns vs Butter" dilemma.
2. 2. How to Produce? (Problem of Choice of Technique):

   Deciding the technological combination of factors of production:

   • Labor-Intensive Technique (LIT): Uses more labor relative to capital; maximizes employment (ideal for labor-surplus nations like India).
   • Capital-Intensive Technique (CIT): Uses more modern machinery relative to labor; maximizes efficiency, precision, and rapid growth.
3. 3. For Whom to Produce? (Problem of Income Distribution):

   Deciding how total national output is distributed among members of society, governed by functional distribution (rent, wages, interest, profit) and personal distribution (wealth equality).

A. Opportunity Cost:

The Opportunity Cost of an economic choice is the value of the next best alternative sacrificed or foregone (e.g., if a graduate rejects a bank job paying ₹50,000 to accept a teaching job paying ₹60,000, the opportunity cost of teaching is the ₹50,000 banking salary foregone).

B. Marginal Opportunity Cost (MOC) / Marginal Rate of Transformation (MRT):

The amount of one commodity ($Y$) that must be sacrificed to produce one additional unit of another commodity ($X$):

The Law of Increasing Marginal Opportunity Cost: As more and more units of commodity $X$ are produced, the amount of commodity $Y$ that must be sacrificed increases continuously. Why? Because resources are not equally efficient in the production of all commodities—transferring workers from wheat farming to gun manufacturing requires taking less specialized labor, reducing productivity.

The Production Possibility Frontier (PPF) is a graphical locus of various combinations of two commodities that an economy can produce efficiently with given resources and technology:

Assumptions of PPC:

• 1. The amount of productive resources in the economy is fixed.
• 2. Resources are fully and efficiently employed (zero idle unemployment).
• 3. The state of technology remains constant.
• 4. Resources are not equally efficient in producing all goods.

The 2 Cardinal Geometric Properties of PPC:

1. 1. PPC Slopes Downward from Left to Right: In an economy operating at full efficiency, producing more of commodity $X$ requires transferring resources away from commodity $Y$, forcing output of $Y$ to fall (negative slope).
2. 2. PPC is Concave to the Origin: The downward-sloping curve bows outward (concave) because of the Law of Increasing Marginal Opportunity Cost (MRT rises). If MRT were constant, PPC would be a straight line; if MRT were decreasing, PPC would be convex.

Positions Relative to PPC:

• Points ON the PPC: Full and efficient utilization of resources.
• Points INSIDE the PPC: Inefficient utilization or underemployment of resources.
• Points OUTSIDE the PPC: Unattainable combinations with currently available resources and technology.

A. Shifts vs Rotations of PPC:

• Rightward (Outward) Shift: Expansion of productive capacity—discovery of mineral reserves, influx of foreign investment (Make in India), growth in labor force, or general technological progress.
• Leftward (Inward) Shift: Destruction of productive capacity—devastating earthquakes, tsunamis, wars, or pandemics destroying physical capital and labor.
• Rotation of PPC: Occurs when technological progress or resource growth happens for only one specific commodity (e.g., green revolution seeds in wheat rotate the PPC outward along the horizontal wheat axis, while the vertical axis remains pinned).

B. How Different Economies Solve Central Problems: