Basic Principles of Economics

Introduction to Economics

Economics is the study of how individuals, institutions, and society make choices under conditions of scarcity. It explores how scarce resources are allocated to satisfy unlimited wants and needs.

• Scarcity: The fundamental economic problem of having seemingly unlimited human wants in a world of limited resources.

• Trade-offs: The concept that to gain something, something else must be given up.

• Opportunity Cost: The value of the next best alternative foregone when making a choice.

Example: If you spend time and money going to a movie, you cannot spend that time at home reading a book, nor can you spend the money on something else. The opportunity cost is the value of the next best alternative (reading a book or saving money).

Microeconomics vs. Macroeconomics

• Microeconomics: Focuses on choices that individuals and businesses make, the factors that influence their choices, and how their choices interact in markets.

• Macroeconomics: Examines the economy as a whole, including issues like inflation, unemployment, and economic growth.

Example: Microeconomics studies how a firm decides how many workers to hire; macroeconomics studies the overall unemployment rate in the economy.

Three Key Economic Ideas

• People are Rational: Individuals and firms use all available information to achieve their goals.

• People Respond to Economic Incentives: Incentives matter in decision-making.

• Optimal Decisions are Made at the Margin: Marginal analysis involves comparing marginal benefits and marginal costs.

Key Formula:

• Allocative Efficiency: Resources are allocated in a way that maximizes the net benefit to society.

Scarcity and Choices

• Scarcity forces individuals and societies to make choices about how to allocate resources.

• Every choice involves a trade-off and an opportunity cost.

Productive and Allocative Efficiency; Equality

• Productive Efficiency: Achieved when goods and services are produced at the lowest possible cost.

• Allocative Efficiency: Achieved when production reflects consumer preferences.

• Equality (Equity): The fair distribution of economic benefits among members of society.

Positive and Normative Statements

• Positive Statements: Claims that can be tested and validated; describe "what is".

• Normative Statements: Claims that attempt to prescribe how the world should be; describe "what ought to be".

Example Table:

Factors of Production

• Land: All natural resources used in production.

• Labor: Physical and mental contributions of people.

• Physical Capital: Factories and equipment used in production.

• Human Capital: Skills and productivity of the labor force.

• Entrepreneurship: The resource that organizes, manages, and assembles the other factors of production.

Circular Flow Diagram

The circular flow diagram illustrates the interactions between households and firms in the markets for goods and services and factors of production.

• Households: Own the factors of production and consume goods and services.

• Firms: Hire factors of production and produce goods and services.

Reading and Understanding Graphs

Graphing Review

• Demand Curve: Shows the relationship between price and quantity demanded.

Calculating Slope of a Straight Line

• The slope of a line measures the rate at which one variable changes with respect to another.

Calculating Slope of a Curve

• Point Method: Draw a tangent line at the selected point and calculate its slope.

• Arc Method: Draw a line connecting two points on the curve and calculate the slope of that line.

Finding Maximum and Minimum Points

• The maximum point on a curve is the highest value (peak).

• The minimum point is the lowest value (trough).

Calculating Area of Geometric Shapes

• Triangle:

• Rectangle:

Correlation and Causation

• Correlation: A relationship between two variables that allows us to predict outcomes.

• Causation: When one event triggers another event.

Example: There may be a correlation between ice cream sales and outside temperature, but this does not mean one causes the other.

Percentage and Decimal Review

Percentage Change Formula:

Fractions Review

• To simplify fractions, find a common factor and divide both numerator and denominator by it.

• To compare fractions, convert them to decimals.

Additional info: These notes provide foundational concepts for microeconomics, including definitions, graphical analysis, and basic mathematical tools used in economic analysis.