The document provides an overview of key concepts in economics including: - Economics trains people to think in terms of alternatives and costs of choices. - Economists use descriptive and analytical approaches including developing models from theories. - Economists serve as scientists when explaining the world using the scientific method and models, and as policymakers when trying to change the world. - Models like the circular flow diagram and production possibilities frontier are used to simplify and explain economic concepts.

1. Thinking Like an
Economist
Chapter 2
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2. Economics trains you to. . . .
 Think in terms of alternatives.
 Evaluate the cost of individual and
social choices.
 Examine and understand how certain
events and issues are related.

3. The Economic Way of Thinking
Includes developing abstract models
from theories and the analysis of the
models.
Uses two approaches:
 Descriptive (reporting facts,
etc.)
 Analytical (abstract reasoning)

4. Two Roles of Economists
When they are trying to explain the
world, they are scientists.
When they are trying to change the
world, they are policymakers.

5. The Economist as a Scientist
The economic way of thinking . . .
 Involves thinking analytically and
objectively.
 Makes use of the scientific method.

6. The Scientific Method
 Develops theories, collects, and analyzes
data to prove the theories.
 Uses abstract models to help explain how
a complex, real world operates.
Observation, Theory and More Observation!

7. Economic Models
 Economists use models to simplify reality in
order to improve our understanding of the world
 Two of the most basic economic models
include:
 The Circular Flow Model
 The Production Possibilities Frontier

8. The Circular-Flow Model
The circular-flow model is a simple
way to visually show the economic
transactions that occur between
households and firms in the
economy.

9. The Circular-Flow Diagram
Firms
Households
Market for Factors of Production
Market for Goods and Services
Spending
Revenue
Wages, rent,
and profit
Income
Goods &
Services sold
Goods &
Services
bought
Labor, land,
and capital
Inputs for
production

10. The Production Possibilities Frontier
The production possibilities frontier is a
graph showing the various
combinations of output that the
economy can possibly produce given
the available factors of production and
technology.

11. The Production Possibilities Frontier
Quantity of
Computers
Produced
Quantity of
Cars Produced
3,000
0 1,000
2,000
700
1,000
300
A
B
2,200
600
C
D

12. Microeconomics and Macroeconomics
Microeconomics focuses on the individual
parts of the economy.
 How households and firms make decisions
and how they interact in specific markets
Macroeconomics looks at the economy as
a whole.
 How the markets, as a whole, interact at the
national level.

13. Economists in Washington . . .
. . . serve as advisers in the
policymaking process of the three
branches of government:
 Legislative
 Executive
 Judicial

14. Positive versus Normative Analysis
 Positive statements are statements
that describe the world as it is.
Called descriptive analysis
Economists as scientists make positive
statements
 Normative statements are statements
about how the world should be.
Called prescriptive analysis
Economists as policymakers make
normative statements

15. Why Economists Disagree
 They may disagree on theories
about how the world works.
 They may hold different values
and, thus, different normative
views.

16. Examples of What Most Economists
Agree On
 A ceiling on rents reduces the
quantity and quality of housing
available.
 Tariffs and import quotas usually
reduce general economic
welfare.

17. ECONOMIC ANALYSIS
EASY AS 1..., 2..., 3...
1. Where are you before any changes? Mark a beginning point
based on the scenario. (A) Tell how you knew where to start.
2. What was the change? What happened in the scenario? Did
production of one good increase? Did we go to war? Restate it
simply here.
3. What was the result of the change?
Short Run Where are we now? What was the immediate impact
on the two variables? Which way on the line did we move? Are
we inside the line?
 Show the result with a new point. (B)
Long Run What happened to the location of the production
possibilities frontier? Did it move in or out?
 If it moved show the new location with a new line and arrows
indicating the direction of change.
 Tell what changed to cause this movement (this must be a change in
a resource or technology).

18. Capital Goods
0 Consumer Goods
PRODUCTION POSSIBILITIES CURVE
1. Begin:
2. Change:
3. Result of Change:
• Short run:
• Long run:
Scenario: While at full-employment new
developments in computer technology cause
many business to invest in new computer
systems.

19. Capital
Goods
Consumer Goods
While at full-employment new
developments in computer
technology cause many
business to invest in new
computer systems.
1. Begin: A , because at
full-employment
2. Change: US
companies increase
purchase and
production of capital
goods.
3. Result of Change:
Move to B
• Short run: Consumer
goods decrease and
Capital goods increase
• Long run: Production
Possibilities Curve
shifts outward due to
more capital.
A
B
Ca2
Ca1
Co2 Co1