Introduction to Microeconomics - Principles Of Microeconomics | Lecture Notes - YNetStudyHub
Principles Of Microeconomics

Introduction to Microeconomics

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This topic introduces the fundamental concepts of microeconomics, including the basic economic problem, opportunity cost, the role of markets, and the principles of supply and demand.

Introduction to Microeconomics
Key concepts, models, and tools for understanding individual economic behavior


1. What Is Microeconomics?

Aspect Description
Scope Study of how households, firms, and markets make decisions and interact.
Focus Individual units (consumers, producers, workers, firms) rather than the whole economy.
Goal Explain how resources are allocated, prices are determined, and welfare is affected.
Contrast with Macro Macro‑economics looks at aggregate variables (GDP, inflation, unemployment).

2. Fundamental Economic Agents

Agent Primary Decisions
Consumers What to buy, how much to consume, how much to save.
Firms What to produce, how much to produce, which production techniques to use.
Workers How much labor to supply, which jobs to accept.
Government (in micro models) Taxation, subsidies, regulation that affect market outcomes.

3. Core Concepts

3.1 Scarcity & Choice

  • Scarcity: Limited resources → need to prioritize uses.
  • Opportunity Cost: Value of the next best alternative foregone.

3.2 Preferences & Utility

  • Preferences: Ranked tastes over bundles of goods.
  • Utility: Numerical representation of satisfaction; used to model choice (e.g., (U = f(x_1, x_2, …))).

3.3 Budget Constraint

[ p_1x_1 + p_2x_2 + \dots + p_nx_n \leq I ]

  • Shows all affordable consumption bundles given prices ((p_i)) and income ((I)).

3.4 Production & Costs

  • Production Function: (Q = f(L, K, …)) – relationship between inputs and output.
  • Cost Curves:
    • Total Cost (TC) = Fixed Cost (FC) + Variable Cost (VC)
    • Average Cost (AC) = TC/Q
    • Marginal Cost (MC) = (\Delta TC / \Delta Q)

3.5 Market Structures

Structure Number of Sellers Product Differentiation Price‑Setting Power
Perfect Competition Many Homogeneous None (price taker)
Monopolistic Competition Many Differentiated Some (downward‑sloping demand)
Oligopoly Few Either Strategic (game theory)
Monopoly One Unique Full (price maker)

3.6 Supply & Demand

  • Law of Demand: Higher price → lower quantity demanded (ceteris paribus).
  • Law of Supply: Higher price → higher quantity supplied.
  • Equilibrium: Intersection of supply and demand curves; determines market price and quantity.

3.7 Elasticities

  • Price Elasticity of Demand (PED): (\displaystyle \frac{% \Delta Q_d}{% \Delta P})
  • Income Elasticity of Demand (YED): (\displaystyle \frac{% \Delta Q_d}{% \Delta I})
  • Cross‑Price Elasticity (XED): (\displaystyle \frac{% \Delta Q_{d,1}}{% \Delta P_2})
  • Price Elasticity of Supply (PES): \
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Unit Syllabus 9 Topics
Introduction to Microeconomics
Consumer Behavior
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Producer Theory
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Market Structures
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Market Equilibrium
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Externalities and Public Goods
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Income Distribution and Market Failure
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International Trade and Globalization
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Economic Policy and Regulation
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