>> If I'm taking multiple hard courses, I only have so much time to spend.

You’re in high school. No course is hard.

>> Free and competitive markets are more efficient than command economies. Arguably, this same principle holds true on an individual level.

This is a silly statement. Free and competitive markets are not always more efficient than command economies, and they certainly aren’t as you move away from a market to a market unit. So, no, your erroneous principle does not arguably hold true on an individual basis. There is a reason that corporations are structured more like a command economy than a free market.