It's more important for the average person than physics, chemistry, advanced math, etc - the only thing as important as economics is history, and to understand history, you need knowledge of economics.
The best introductory economics book IMO is Henry Hazlitt's "Economics in One Lesson."
Best of luck with your teaching!
"Alas! I believe in the virtue of birds. And it only takes a feather for me to die laughing."
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