Microeconomics Review: Market Structures, Costs, Demand & Efficiency

TAKEAWAYS:

• Market structures (perfect competition, monopoly, oligopoly) determine pricing strategies and efficiency, with Daraz’s oligopolistic pricing as a key example.
• Cost curves (AFC, AVC, MC, ATC) explain profit maximization, illustrated by Ncell’s marginal cost of adding a new customer.
• Elasticity of demand (price, income, cross) predicts revenue changes, critical for eSewa’s dynamic fee adjustments.
• Welfare economics (Pareto efficiency, deadweight loss) justifies government interventions like NEPSE’s market regulations.
• Game theory basics (Nash equilibrium) explain strategic pricing in NTC vs. Ncell’s spectrum auctions.
• Real-world linkages connect theory to business (e.g., Pathao’s surge pricing under oligopoly) and policy (e.g., minimum wage laws under factor markets).

1. Recap: Core Microeconomic Concepts

Microeconomics studies individual decision-making by households, firms, and governments. This unit integrates:

• Market structures (how firms compete/cooperate).
• Production and cost analysis (how firms minimize costs).
• Demand theory (how consumers respond to prices).
• Welfare economics (how markets allocate resources efficiently).

2. Market Structures: From Perfect Competition to Monopoly

Firms operate under different market structures, each with distinct pricing and output behaviors.

Classification of Market Structures

mindmap
  root((Market Structures))
    Perfect Competition
      Many Sellers
      Homogeneous Product
      Price Takers
      Free Entry/Exit
    Monopolistic Competition
      Many Sellers
      Differentiated Product
      Some Price Control
      Free Entry/Exit
    Oligopoly
      Few Sellers
      Homogeneous/Differentiated
      Interdependent Pricing
      Barriers to Entry
    Monopoly
      Single Seller
      Unique Product
      Price Maker
      High Barriers to Entry

Key Differences

Real-World Example: Daraz’s Oligopolistic Pricing

Daraz operates in an oligopoly alongside Sastodeal and Amazon Nepal. Unlike perfect competition, Daraz:

• Differentiates products (brand deals, discounts).
• Watches rivals’ prices (e.g., if Sastodeal lowers laptop prices, Daraz may match or offer bundles).
• Has some pricing power (e.g., "Prime Day" sales create artificial scarcity).

Worked Example: Suppose Daraz and Sastodeal each sell a ₹5,000 smartphone:

• If Daraz raises price to ₹5,500, demand drops (cross-elasticity: consumers switch to Sastodeal).
• If both raise prices by ₹500, total revenue may rise (due to oligopoly pricing coordination).

3. Production and Cost Analysis: The Firm’s Decision-Making

Firms aim to maximize profit by balancing revenue and costs.

Short-Run Cost Curves

• AFC (Average Fixed Cost): ₹50 (fixed costs like spectrum licenses).
• AVC (Average Variable Cost): ₹100 (variable costs like call minutes).
• MC (Marginal Cost): ₹150 (cost of serving the 10,000th customer).
• ATC (Average Total Cost): ₹150 (AFC + AVC at Q=10,000).

Key Insight:

• If Ncell adds a customer at MC < ATC, it reduces average costs (economies of scale).
• If MC > ATC, diseconomies of scale occur (e.g., overcrowded towers).

Long-Run Costs and Returns to Scale

flowchart TD
    A["Output (Q)"] --> B["Short Run: Fixed Plant"]
    B --> C["Increasing Returns: 0 < Q < Q1"]
    B --> D["Constant Returns: Q1 = Q2"]
    B --> E["Decreasing Returns: Q2 < Q"]
    A --> F["Long Run: Variable Plant"]
    F --> G["Economies of Scale: ATC Falls"]
    F --> H["Diseconomies of Scale: ATC Rises"]

Example: NTC’s Economies of Scale

• Initially, adding more towers reduces ATC (shared infrastructure).
• Later, bureaucracy increases costs (diseconomies).

4. Demand Theory: Elasticity and Revenue Maximization

Firms adjust prices based on demand elasticity.

Price Elasticity of Demand (PED)

• Elastic (|PED| > 1): Small price change → large quantity change. Example: If eSewa raises fees from ₹1 to ₹2, transactions drop by 50%.
• Inelastic (|PED| < 1): Small price change → small quantity change. Example: NTC’s call rates (inelastic demand for basic calls).

Total Revenue (TR) and PED

Worked Example: eSewa’s Fee Adjustment

• Current: ₹1 fee, 10,000 transactions/day → TR = ₹10,000.
• If eSewa raises fee to ₹1.50:
  • PED = -2 → Q drops by 50% (5,000 transactions).
  • New TR = ₹7,500 (↓25%).

5. Theory of the Firm: Profit Maximization

Firms maximize profit where MR = MC.

Profit Maximization Rule

• Output (Q): Where MR = MC (10,000 units).
• Price (P): Read from demand curve at Q=10,000 (₹400).
• Profit: (P - ATC) × Q = (₹400 - ₹200) × 10,000 = ₹2,000,000.

Comparison Table: Perfect Competition vs. Monopoly

6. Factor Markets and Income Distribution

Factors of production (land, labor, capital) are paid rent, wages, interest, and profit.

Derived Demand

• Labor Demand: Depends on marginal product of labor (MPN). Example: Pathao drivers are hired based on how many rides they enable.

Wage Determination

• Equilibrium: Where labor supply meets demand.
• Minimum Wage Laws: Government intervention (e.g., ₹15,000 minimum wage) can create unemployment if set above equilibrium.

7. Market Equilibrium and Government Intervention

Markets fail when:

• Monopolies exploit consumers.
• Externalities (e.g., pollution from NTC towers).
• Public goods (e.g., national defense) are underprovided.

Government Tools

8. Economic Efficiency and Welfare Economics

Efficiency measures how well resources are allocated.

Pareto Efficiency

• No one can be made better off without making someone worse off.
• Example: If NTC merges with Ncell, consumers may lose (higher prices).

Deadweight Loss (DWL)

• Monopoly: DWL = ₹500,000 (lost consumer surplus).
• Perfect Competition: DWL = ₹0.

9. Practical Applications: Linking Theory to Business

Case 1: Pathao’s Surge Pricing (Oligopoly)

• Scenario: Heavy rain in Kathmandu → surge pricing (₹200 → ₹400).
• Why?:
  • Inelastic demand (passengers need rides).
  • Oligopoly power (Pathao vs. Uber Nepal).
• Outcome: Higher revenue for drivers, but consumer backlash.

Case 2: NEPSE’s Market Regulations (Monopoly)

• Scenario: NEPSE (stock exchange) restricts foreign investors.
• Economic Impact:
  • Lower liquidity → higher transaction costs.
  • Deadweight loss from inefficient allocation.

10. Game Theory: Strategic Interactions

Firms often act strategically (e.g., NTC vs. Ncell’s spectrum auctions).

Nash Equilibrium Example

sequenceDiagram
  participant NTC
  participant Ncell
  NTC->>Ncell: "Raise prices to ₹100"
  Ncell->>NTC: "Match at ₹100 (Nash Equilibrium)"
  Note over NTC,Ncell: Both firms earn higher profits than if one cheated.
  Note right of NTC: Profit = π₁
  Note right of Ncell: Profit = π₂
  Note over NTC,Ncell: π₁ > π₁* (if NTC cheated)
  Note over NTC,Ncell: π₂ > π₂* (if Ncell cheated)

Key Takeaway:

• Collusion (e.g., price-fixing) is illegal but tempting.
• Nash Equilibrium is stable but may not be efficient.

In the Real World

1. Daraz’s Dynamic Pricing (Oligopoly)

   • Uses real-time demand data to adjust prices (e.g., "limited stock" labels).
   • Idea: Price discrimination (charging different customers different prices).

2. Ncell’s Marginal Cost Pricing (Cost Analysis)

   • Charges ₹15 per GB after analyzing MC = ₹15 (server costs, bandwidth).
   • Idea: Marginal cost pricing ensures efficiency.

3. eSewa’s Transaction Fees (Elasticity)

   • Tests ₹1 vs. ₹2 fees and sees TR drop by 30% when raising to ₹2.
   • Idea: Price elasticity guides fee adjustments.

4. NEPSE’s Market Regulations (Welfare Economics)

   • Limits short-selling to prevent crashes.
   • Idea: Market intervention to reduce systemic risk.

Exam Tip: How This Unit is Tested

1. Conceptual Questions (30%)

   • Define Nash equilibrium, deadweight loss, or Pareto efficiency.
   • Example: "Explain why a monopoly produces less than perfect competition."

2. Numerical Problems (40%)

   • Calculate profit-maximizing output (MR=MC).
   • Example: "If MC = 10Q + 50 and MR = 100 - 2Q, find Q and P."

3. Real-World Applications (30%)

   • Compare Daraz’s oligopoly vs. NTC’s monopoly.
   • Example: "How does eSewa’s inelastic demand affect its pricing strategy?"

Pro Tip:

• Draw curves (demand, cost, welfare) for full marks.
• Use Nepal examples (Daraz, NTC, eSewa) to stand out.
• Link theory to policy (e.g., minimum wage → unemployment).