Activity
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The Production Possibilities Frontier

For Students 9th - 10th
This site shows an good example of opportunity costs along with related production possibilities curves.
Article
Khan Academy

Khan Academy: Ap Macroeconomics: Lesson Summary: Opportunity Cost and the Ppc

For Students 9th - 10th Standards
In this lesson summary, review the key concepts, key terms, and key graphs for understanding opportunity cost and the production possibilities curve.
Lesson Plan
Khan Academy

Khan Academy: Lesson Summary: Introduction to Macroeconomics

For Students 9th - 10th Standards
This article summarizes the learning objectives and essential knowledge for the lesson on Scarcity. Here you will find key terms, key concepts, common misperceptions, and discussion questions to help you review what you have learned....