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Open Educational Resources (OER)
Open Educational Resources (OER) are freely accessible, openly licensed documents and media that are useful for teaching, learning, and assessing as well as for research purposes.
These two texts contain all of the fundamental concepts discussed in typical college level Principles of Macroeconomics and Principles of Microeconomics courses.
In addition to clearly written text, there are 235 verbal explanations (audio and scripted captions), many Internet links, a few interactive graphs and formulas, and end-of-unit games to test your knowledge of the material.