ECC1000 Study Guide - Midterm Guide: Comparative Advantage, Absolute Advantage, Opportunity Cost

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Chapter 2: Thinking Like an Economist
Economists make assumptions for the same reason: Assumptions can simplify the complex world and
make it easier to understand.
Economists use different assumptions to answer different questions.
• Suppose that we want to study what happens to the economy when the government changes
the number of dollars in circulation. An important piece of this analysis, it turns out, is how
prices respond.
• Many prices in the economy change infrequently; the newsstand prices of magazines, for
instance, change only once every few years.
• Knowing this fact may lead us to make different assumptions when studying the effects of the
policy change over different time horizons.
Economic Models (page 22)
• Economic models omit many details to allow us to see what is truly important
• All models are built with assumptions
The Production Possibilities Frontier Model (page 24)
A graph that shows the combinations of output that the economy can possibly produce given the
available factors of production and the available production technology
• One of the Ten Principles of Economics discussed in Chapter 1 is that people face trade-offs
• The production possibilities frontier shows one trade-off that society faces.
• Once we have reached an efficient point on the frontier, the only way of producing more of
one good is to produce less of the other.
• The cost of something is what you give up to get it. This is called the opportunity cost.
• The production possibilities frontier shows the opportunity cost of one good as measured in
terms of the other good.
• With the resources it has, the economy can produce at any point on or inside the production
possibilities frontier, but it cannot produce at points outside the frontier.
• An outcome is said to be efficient if the economy is getting all it can from the scarce
resources it has available.
• Points on (rather than inside) the production possibilities frontier represent efficient levels of
production.
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