PowerPoint to accompany Chapter 1 Economics: Foundations and Models

PowerPoint

to accompany

Chapter 1

Economics: Foundations and Models

Hubbard, Garnett, Lewis and O’Brien: Essentials of Economics © 2010 Pearson Australia

Learning Objectives1. Discuss these three important economic

ideas: people are rational; people respond to incentives; optimal decisions are made at the margin.

2. Understand the issues of scarcity and trade-offs, and how the market makes decisions on these issues.

3. Understand the role of economics in modern analysis.

4. Distinguish between microeconomics and macroeconomics.


Water scarcity and its consequences

Many regions across the Australian continent face intense water scarcity. The challenge facing the nation is therefore the efficient management of this scarce resource to maximise the possible benefits across various uses.


Economics is the study of the choices people and societies make to attain their unlimited wants, given their scarce resources.

In this subject we study how people make choices and interact in markets.

Market: A group of buyers and sellers of a good or service and the institution or arrangement by which they come together to trade.

LEARNING OBJECTIVE 1

Economics and Individual Decisions


Three ideas are primary throughout the subject:

1. People are rational.

2. People respond to economic incentives.

3. Optimal decisions are made at the margin.

Marginal Analysis: Analysis that involves comparing marginal benefits and marginal costs.


Economics and Individual Decisions


Scarcity: The situation in which unlimited wants exceed the limited resources available to fulfill those wants.

Trade-off: The idea that, because of scarcity, producing more of one good or service means producing less of another good or service.


Scarcity and Trade-offs


Trade-offs force society to make choices.

This is especially true with respect to three fundamental questions:

1. What goods and services will be produced?

2. How will the goods and services be produced?

3. Who will receive the goods and services produced?




1. What goods and services will be produced?

When choosing between alternative options, economists use the concept of opportunity cost.

Opportunity cost: The opportunity cost of any activity is the highest-valued alternative that must be given up to engage in the activity under consideration.




2. How will the goods and services be produced?

In many cases, firms face a trade-off between using more workers and using more machines.

3. Who will receive the goods and services produced?

This largely depends on how income is distributed.




Centrally planned economies versus market economies

Centrally planned economy: An economy in which the government decides how economic resources will be allocated.

Market economy: An economy in which the decisions of households and firms interacting in markets determine the allocation of economic resources.




A central feature of market economies is consumer sovereignty.

Consumer sovereignty occurs because firms must produce goods and services that meet the wants of the consumers, in order to be successful.

It is therefore consumers who ultimately decide what will be produced.




The modern economy is a ‘mixed’ economy:

Mixed economy: An economy in which most economic decisions result from the interaction of buyers and sellers in markets, but in which the government plays a significant role in the allocation of resources.




Efficiency and Equity

Productive efficiency: The situation in which a good or service is produced using the least amount of resources.

Allocative efficiency: A state of the economy in which production reflects consumer preferences; in particular, every good or service is produced up to the point where the last unit provides a marginal benefit to consumers equal to the marginal cost of producing it.

Dynamic efficiency: Occurs when new technology and innovation are adopted over time.




Voluntary exchange: The situation that occurs in markets when both buyer and seller of a product are made better off by the transaction.

Equity: A fair distribution of economic benefits between individuals and between societies.

An efficient outcome may or may not be considered by society to be equitable.




Scarcity and trade-offs

Fortunately for the world’s developed nations, they no longer face the problem of scarcity. As a result, they can direct their efforts to addressing scarcity in developing nations.

Do you agree with this statement? Explain why or why not.



Scarcity and trade-offsSolving the problem:

STEP 1: Review the material. This problem is about the concept of scarcity as it is defined in economics. This is covered on pages 4 and 7 of the text.

STEP 2: The concept of scarcity as defined in economics is based on the assumption of unlimited human wants. Resources will always be scarce in this context, regardless of whether we are in the developed or developing world. Human beings will always want more than they have, and every society is therefore faced with the problem of allocating its scarce resources to maximise the satisfaction of wants.



Economic models: Simplified versions of reality used to analyse real-world economic situations.


Economic Models


To develop a model economists generally follow these steps:

1. Decide on the assumptions to be used in developing the model.

2. Formulate a testable hypothesis.

3. Use economic data to test the hypothesis.

4. Revise the model if it fails to explain the economic data.

5. Retain the revised model to help answer similar economic questions in the future.


Economic Models


Forming and testing hypotheses in economic models.

A hypothesis in an economic model: A statement about an economic variable that may be either correct or incorrect.

Economic variable: Something measurable that relates to resources that can have different values, for example, wages, prices, litres of water.

In testing hypotheses, economists distinguish between correlation and causality.


Economic Models


Normative and positive analysis

Positive analysis: Analysis concerned with what is.

Involves value-free statements that can be tested by using the facts.

Normative analysis: Analysis concerned with what ought to be.

Involves making value judgments which cannot be tested.


Economic Models



Which of the following represent a positive analysis and which represent a normative analysis? Explain your answer.

a) Unemployment in Australia is currently 8.5%.

b) The unemployment rate in Australia is too high and policies should be devised to reduce the unemployment rate.

c) When unemployment falls, wages increase.




Solving the problem:

STEP 1: Review the material. This problem relates to normative and positive analysis which is covered on pages 13 – 14 of the text.

STEP 2: Answering a) This is a positive statement as it can be verified or refuted by reference to data on unemployment.




STEP 3: Answering b) This is a normative statement. Whether resources should be allocated to reducing the unemployment rate involves value judgments.

STEP 4: Answering c) This is a positive statement as it can be verified by reference to the facts - although it may be difficult to isolate the relationship between falling unemployment and rising wages.



Economists don’t always agree

Former federal economic policy adviser, Dr Fred Argy, reminds current and future policy makers that economics is not an exact science.


Microeconomics: The study of how households and firms make choices, how they interact in markets, and how the government attempts to influence their choices.

Macroeconomics: The study of the economy as a whole, including topics such as inflation, unemployment, and economic growth.


Microeconomics and Macroeconomics


Figure 1. Water use in Australia, 2004-05

An Inside Look


Key Terms Allocative efficiency Centrally planned

economy Consumer

sovereignty Dynamic efficiency Economic models Economic variable Economics Equity Macroeconomics Marginal analysis

Market Market economy Microeconomics Mixed economy Normative analysis Opportunity cost Positive analysis Productive (technical)

efficiency Scarcity Trade-off Voluntary exchange


Q1. Which of the following statements best describes scarcity?

a. Scarcity studies the choices people make to attain their goals.

b. Scarcity is a situation where unlimited wants exceed limited resources.

c. Scarcity is an imbalance between buyers and sellers in a specific market.

d. Scarcity refers to a lack of trade-offs.

Check Your Knowledge


Q1. Which of the following statements best describes scarcity?

a. Scarcity studies the choices people make to attain their goals.

b. Scarcity is a situation where unlimited wants exceed limited resources.

c. Scarcity is an imbalance between buyers and sellers in a specific market.

d. Scarcity refers to a lack of trade-offs.



Q2. What does an economy achieve by producing a good or service using the least amount of resources?

a. Productive efficiency

b. Allocative efficiency

c. Voluntary exchange

d. Equity



Q2. What does an economy achieve by producing a good or service using the least amount of resources?

a. Productive efficiency

b. Allocative efficiency

c. Voluntary exchange

d. Equity



Q3. What is the purpose of an economic hypothesis?

a. To establish a behavioural assumption.

b. To establish a causal relationship.

c. To make a statement based on fact.

d. To determine the validity of statistical analyses used in testing a model.



Q3. What is the purpose of an economic hypothesis?

a. To establish a behavioural assumption.

b. To establish a causal relationship.

c. To make a statement based on fact.

d. To determine the validity of statistical analyses used in testing a model.



Q4. What type of statement would ‘A minimum wage actually reduces unemployment’ be considered?

a. A positive statement

b. A marginal statement

c. A normative statement

d. An irrational conclusion



Q4. What type of statement would ‘A minimum wage actually reduces unemployment’ be considered?

a. A positive statement

b. A marginal statement

c. A normative statement

d. An irrational conclusion



Graphs can be compared to maps – they provide a simplified guide to reality.

Appendix


Figure 1A.1 Bar graphs and pie charts

Appendix


Figure 1A.2 Line graphs

Appendix


Figure 1A.3 Plotting price and quantity points on a graph

Appendix


Figure 1A.4 Calculating the slope of a line

Appendix


Figure 1A.5 Showing three variables on a graph

Appendix


Figure 1A.6 A positive relationship between two variables.

Appendix


Figure 1A.7 The slope of a non-linear curve

Appendix


Figure 1A.8 Showing a firm’s total revenue on a graph

Appendix


Figure 1A.9 The area of a triangle

Appendix

Documents

PowerPoint to accompany Chapter 1 Economics: Foundations and Models