Ruminating on this post by Gabriel Mihalache reminded me of this. It's Preston McAfee's introductory econ text. Since I'm teaching MBA microeconomics this summer, I need to make a note to put this on the list of suggested supplements.
Gabriel has noted some other free books and notes out there as well. The variety of what's out there for economics is truly amazing. McAfee's text is fine for a principles course at Cal Tech but probably too advanced for principles courses at most places. However, one could put it on the reading list as an optional supplement for more advanced courses, as I intend to do.

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