Chapter 2: Thinking Like an Economist – Principles of Macroeconomics

Thinking Like an Economist

Introduction to Economic Methodology

This chapter provides an overview of how economists approach questions about the world, focusing on the methodology and mindset that distinguishes economic analysis. Understanding these foundational concepts is essential for studying macroeconomics and interpreting economic phenomena.

• Key Questions:

  • What is distinctive about how economists confront a question?

  • What does it mean to think like an economist?

The Economist as Scientist

The Scientific Method: Observation, Theory, and More Observation

Economists strive to apply scientific objectivity to their subject matter, using the scientific method to develop and test theories about economic behavior.

• Observation: Economists collect and analyze data to observe patterns and relationships.

• Theory: Observations help economists develop theories to explain economic phenomena.

• Challenges:

  • Experiments are often difficult in economics due to the inability to generate new data at will.

  • Economists rely on natural experiments and available data.

The Role of Assumptions

Assumptions are used to simplify complex realities, making economic models more manageable and understandable.

• Purpose: To focus on essential elements and ignore less relevant details.

• Example: Studying international trade by assuming only two countries and two goods helps clarify basic principles before adding complexity.

Economic Models

Models are simplified representations of reality, often using diagrams and equations, to highlight important relationships and mechanisms in the economy.

• Characteristics:

  • Omit many details to focus on what is truly important.

  • Built with assumptions to simplify reality.

• Goal: Increase understanding by clarifying key economic relationships.

Our First Model: The Circular-Flow Diagram

The circular-flow diagram is a visual model that illustrates how money flows through the economy between households and firms.

• Components:

  • Two decision makers: households and firms.

  • Two markets: goods market and factor market.

• Roles:

  • Firms: Sellers in the goods market, buyers in the factor market.

  • Households: Buyers in the goods market, sellers in the factor market.

• Flows:

  • Inner loop: Flows of inputs and outputs.

  • Outer loop: Flows of dollars between households and firms.

Example: Following a Dollar Coin

• A dollar starts in a household's wallet.

• It is spent in the goods market (e.g., buying coffee at Tim Hortons).

• The firm receives the dollar as revenue, then spends it on inputs (rent, wages).

• The dollar returns to households as income, completing the circular flow.

Our Second Model: The Production Possibilities Frontier (PPF)

Definition and Interpretation

The production possibilities frontier (PPF) is a graph that shows the combinations of output an economy can produce given its resources and technology.

• Example: An economy producing only cars and computers.

• If all resources go to cars: 1000 cars, 0 computers.

• If all resources go to computers: 3000 computers, 0 cars.

• Intermediate points show trade-offs between the two goods.

Efficient and Inefficient Points

• Efficient: Points on the PPF represent efficient use of resources.

• Inefficient: Points inside the PPF indicate resources are underutilized.

• Impossible: Points outside the PPF are unattainable with current resources.

Opportunity Cost and Trade-offs

• Moving along the PPF involves shifting resources from one good to another, illustrating opportunity cost.

• Formula: Opportunity cost of good X = Amount of good Y forgone / Amount of good X gained

Table: Production Possibilities Frontier Example

Point on graph	Production of Computers	Production of Wheat
A	500	0
B	400	1000
C	250	2500
D	100	4000
E	0	5000

To produce every additional 100 computers, the economy must give up 1000 tonnes of wheat.

Shifts in the PPF

• The PPF shifts outward if resources or technology improve, allowing more production of both goods.

Microeconomics and Macroeconomics

Definitions and Distinctions

• Microeconomics: The study of how households and firms make decisions and interact in markets.

• Macroeconomics: The study of economy-wide phenomena, including inflation, unemployment, and economic growth.

• Both fields are interconnected, but they address different questions and use different models.

The Economist as Policy Adviser

Positive vs. Normative Analysis

• Positive Statements: Claims that describe the world as it is. Example: "Minimum-wage laws cause unemployment."

• Normative Statements: Claims that prescribe how the world should be. Example: "The government should raise the minimum wage."

• Positive statements can be tested with data; normative statements reflect value judgments.

Discussion Examples

• "Prices rise when the government increases the quantity of money." – Positive

• "The government should print less money." – Normative

• "A tax cut is needed to stimulate the economy." – Normative

• "An increase in the price of burritos will cause an increase in consumer demand for movie streaming." – Positive

Economists in Policy and Government

• Economists advise government departments on tax policy, trade agreements, labor market policies, and environmental regulations.

• Statistics Canada employs economists to collect and analyze data for policy decisions.

Why Economists' Advice Is Not Always Followed

• Government decisions involve trade-offs and considerations beyond economic analysis.

• Recommendations may not always be implemented due to political or practical constraints.

Why Economists Disagree

• Disagreements arise from differences in scientific judgments (positive theories) and values (normative views).

• Some disagreement is inevitable, but economists often share common views on many issues.

Table: Propositions about Which Most Economists Agree

Proposition	Percentage Agreement
A ceiling on rents reduces the quantity and quality of housing available.	93%
Tariffs and import quotas usually reduce general economic welfare.	93%
Flexible and floating exchange rates offer an effective international monetary arrangement.	90%
Fiscal policy (e.g., tax cuts and/or government expenditure increases) has a significant stimulative impact on a less than fully employed economy.	90%
The government should not restrict employers from outsourcing work to foreign countries.	90%
Economic growth in developed countries like Canada leads to greater levels of well-being.	88%
Agricultural subsidies should be eliminated.	85%
An appropriately designed fiscal policy can increase the long-run rate of capital formation.	85%
Local and state governments should eliminate subsidies to professional sports franchises.	85%
If the federal budget is to be balanced, it should be done over the business cycle rather than yearly.	85%
Cash payments increase the welfare of recipients to a greater degree than do transfers-in-kind of equal cash value.	84%
A large federal budget deficit has an adverse effect on the economy.	83%
The redistribution of income is a legitimate role for the government.	83%
Inflation is caused primarily by too much growth in the money supply.	79%
Minimum wage increases unemployment among young and unskilled workers.	79%
The government should restructure the welfare system along the lines of a "negative income tax."	79%
Effluent taxes and marketable pollution permits represent a better approach to pollution control than imposition of pollution ceilings.	79%

Key Formulas and Equations

• Opportunity Cost: $\text{Opportunity Cost of Good X} = \frac{\text{Amount of Good Y forgone}}{\text{Amount of Good X gained}}$

Summary

This chapter introduces the scientific approach, models, and key distinctions in economics, providing foundational tools for analyzing macroeconomic issues such as growth, inflation, and policy decisions.