This idea is overused as heavily dependant on which school you go to. My school taught a finance course, and gave advice on job seeking and interviews.
Also, mitochondria is usually taught at GCSE in the UK at least, which is not the last year of school. 'Mitochondria is the powerhouse of the cell' is very much a meme, it might have been interesting to use any other piece of useless information taught in schools instead.
No high schooler is EVER gonna pay even the slightest bit of attention if we incorporate a “taxes and accounting” class. No shot.
We learn certain general subjects like this in science mainly to learn critical thinking, analytical/logical reasoning skills, how to apply the scientific method (which, yes, can come in handy in many areas of life besides science).
Lol. Mainstream economics is nothing but ideologically charged excuses for the status quo. And you wouldn't learn heterodox econ in high school anyways.
Frankly, we should move on from the mitochondria and start talking about the immune system. I want pre-schoolers to know about the interleukins, goddamnit! Let the children in first grade recite a list of adjuvants! And somebody shootshoo away vaccine deniers!
If we're going to scrap something from high school to add a tax lesson, let's ditch some literature. Over four years my graduating class studied 5 shakespeare plays and a handful of sonnets. Surely we could have cut out Much Ado About Nothing and The Tempest if we still have Romeo & Juliet, Hamlet and Henry V.