Consumer Theory Core Knowledge Learning Guide
The guide systematically outlines the core framework of consumer theory, starting from foundational concepts such as utility and preference, and gradually delving into key topics like budget constraints, optimal choices, and the derivation of the demand curve. By combining regularity with empirical methods, it helps learners grasp the analytical logic of consumer behavior and understand the internal mechanisms of consumption decisions.
Foundation of Consumer Theory: Utility and Preference
Concept of Utility and its types (Cardinal Utility, Ordinal Utility)
- The core definition of utility: The degree of satisfaction consumers obtain from the consumption of goods.
- Cardinal Utility Theory: Measurable Utility and Numerical Comparison Logic
- Ordinal Utility Theory: Ordering of Utility and Preference Expression (the foundation of indifference curves)
- Differences and Application Scenarios of Cardinal Utility and Ordinal Utility
Consumer Preferences Assumptions (Completeness, Transitivity, Non-satiation, etc.)
- Completeness Assumption: Consumers can clearly determine their preferences for any two commodity combinations.
- Transitivity Assumption: Preference Consistency Logic (if A > B and B > C, then A > C)
- Hypothesis of Non-Satiation: Consumers prefer more numerous combinations of the same goods.
- Other Assumptions: The Connotation and Economic Implications of the Convexity Assumption
- Theoretical Value of the Preference Hypothesis: Foundation of Consumer Behavior Analysis
Construction and Analysis of Utility Functions
- Definition of the Utility Function: Mathematical Expression of Preference and Utility
- Common utility function types: Cobb-Douglas utility function, completely substitutable/complementary utility functions
- Marginal Analysis of Utility Functions: Mathematical Solution of Marginal Utility and Economic Implications
- Analysis of Monotonicity and Convexity Characteristics of Utility Functions
Constraints on Consumer Choices and Optimal Decisions
Budget Constraints and Consumer Choices
- The Core Principle of Budget Constraints: Income and Prices of Goods as Constraints on Consumption
- Construction of the Budget Line: Mathematical Expressions and Graphical Representation
- Changes in the Budget Line: Income and Price Changes Impacting the Budget Line
- Analysis of the feasible and infeasible sets under budget constraints
Consumer Optimal Choice (Utility Maximization Problem)
- Core Objective of Utility Maximization: Consumption Decision Criteria Under Budget Constraints
- Equilibrium Condition of Optimal Choice: Marginal Rate of Substitution Equals the Ratio of Prices of Goods
- Optimal Choice Cases in Different Preference Types (Completely Substitute, Completely Complementary, General Preference)
- Mathematical Solution of the Utility Maximization Problem (An Introduction to the Lagrange Multiplier Method)
Law of Diminishing Marginal Utility
- Law of Diminishing Marginal Utility: The trend of changes in marginal satisfaction when continuously consuming a commodity.
- Real-world examples of diminishing marginal utility and their theoretical explanations
- The Impact of the Law of Diminished Marginal Utility on Consumer Choices
- The Inherent Relationship Between Marginal Utility Decreases and the Demand Curve
Demand Curve and the Influence of Price Changes
Derivation of the Consumer Demand Curve
Income Effect and Substitution Effect (Slater's Decomposition)
- Dual Effects of Price Changes: Definition of Income Effect and Substitution Effect
- Slutsky Decomposition's Core Logic: Analysis of the Substitution Effect Maintaining Purchasing Power Constant
- Comparison of the Income and Substitution Effects on Normal, Inferior, and Giffen Goods
- Slezak's Decomposition Graphical Demonstration and Mathematical Expressions
Application and Empirical Analysis of Consumer Theory
Calculation and Significance of Consumer Surplus
- Definition of consumer surplus: the difference between the actual payment and the willingness to pay
- Consumer Surplus Graphical Representation (The Area Under the Demand Curve and Above the Price Line)
- Methods of Calculation of Consumer Surplus: Discrete-Type and Continuous-Type Examples
- Consumer Surplus's Policy Implications: The Core Tool of Welfare Analysis
Empirical Analysis Methods in Consumer Behavior
- The Core Objective of Empirical Analysis: Testing the Real-World Applicability of Consumer Theory
- Common Empirical Methods: Questionnaire Survey Method, Experimental Economics Method, Big Data Consumer Behavior Analysis
- Estimation of the Demand Function: Application of Quantitative Models in Consumer Behavior Analysis
- Limitations and Improvement Directions of Empirical Analysis