They don’t teach Free Market Economics, the only sound economic system.
Why don’t they teach it? Same reason they don’t teach the U.S. Constitution or the Bible.
Free Market Economics, the U.S. Constitution, and the Bible promote and propagate individual liberty and pursuits which is the road to success and wealth (John Adams, “The Wealth of Nations” as demonstrated in 1800’s America, emerging into the 1900’s as the freest, wealthiest, and most powerful nation on earth).
Conversely Free Market Economics, the U.S. Constitution, and the Bible dissuade trusting in and relying on gov’t or man for well being and livelihood. All counter to today’s dysfunctional popular culture, unsound conventional wisdom, and lying “political correctness” which is the road to poverty and serfdom (Friedrich Hayek, “The Road to Serfdom” as demonstrated by countless poverty-stricken nations and totalitarian regimes).
Free market example. https://youtu.be/IYO3tOqDISE?si=yc-KREPJ_gDpPdO1