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The Scope and Method of Economics. Appendix: How to Read and Understand Graphs. The Study of Economics. Economics is the study of how individuals and societies choose to use the scarce resources to satisfy unlimited human wants. Why Study Economics?. Three fundamental concepts:
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The Scope andMethod of Economics Appendix: How to Read and Understand Graphs
The Study of Economics • Economics is the study of how individuals and societies choose to use the scarce resources to satisfy unlimited human wants.
Why Study Economics? Three fundamental concepts: • Scarcity • Choice • Opportunity cost
Opportunity Cost • Opportunity cost is the best alternative that we forgo, or give up, when we make a choice or a decision. • Nearly all decisions involve trade-offs.
The Scope of Economics • Microeconomics is the branch of economics that examines the behavior of individual decision-making units—that is, business firms and households.
The Scope of Economics • Macroeconomics is the branch of economics that examines the behavior of economicaggregates— income, output, employment, and so on—on a national scale.
The Method of Economics • Positive economics studies economic behavior without making judgments. It describes what exists and how it works.
The Method of Economics • Normative economics, also called policy economics, analyzes outcomes of economic behavior, evaluates them as good or bad, and may prescribe courses of action.
Theories and Models • Theories involve models, and models involve variables. • A model is a formal statement of a theory. Models are descriptions of the relationship between two or more variables.
Theories and Models • A variable is a measure that can change from observation to observation. • The ceteris paribus device is part of the process of abstraction. • Using the ceteris paribus, or all else equal, assumption, economists study the relationship between two variables while the values of other variables remain constant.
Economic Policy Criteria for judging economic outcomes: • Efficiency, or allocative efficiency. An efficient economy is one that produces what people want at the least possible cost. • Equity, or fairness of economic outcomes.
Economic Policy Criteria for judging economic outcomes: • Economic growth, or an increase in the total output of an economy. • Economic stability, or the condition in which output is steady or growing, with low inflation and full employment of resources.
A graph is a two-dimensional representation of a set of numbers or data. Appendix:How to Read and Understand Graphs
Appendix:How to Read and Understand Graphs • A time series graph shows how a single variable changes over time.
The Cartesian coordinate system is the most common method of showing the relationship between two variables. The horizontal line is the X-axis and the vertical line the Y-axis. The point at which the horizontal and vertical axes intersect is called the origin. Appendix:How to Read and Understand Graphs
Appendix:How to Read and Understand Graphs • The point at which the line intersects the Y-axis (point a) is called the Y-intercept. • The Y-intercept, is the value of Y when X = 0.
Appendix:How to Read and Understand Graphs • The slope of the line indicates whether the relationship between the variables is positive or negative. • The slope of the line is computed as follows:
This line slopes upward, indicating that there seems to be a positive relationship between income and spending. Appendix:How to Read and Understand Graphs
Appendix:How to Read and Understand Graphs An upward-sloping line describes a positive relationship between X andY. A downward-sloping line describes a negative relationship between X and Y.
