A few things I learned from Economics in college that have ended up being generally applicable in life and at work.

1. Opportunity Cost: The cost of something is what you don't get to do as an alternative. If I stay late at work, I miss dinner with my family.

2. Sunk Cost Fallacy: Don't stick with something just because you've put time, effort or money into it. Evaluate continuing against simply doing something else. If I start a new Netflix series that sucks, I don't have to finish it.

@carnage4life sunk cost fallacy is my favourite. I see so much wasted time because of it.

@carnage4life I love these as a pair in particular, because they are easy to wrongly correlate (“I'm already late for dinner, so I missed my opportunity and may as well work another hour or two”)

Shane Parrish's 4-volume series "The Great Mental Models" is replete with great examples like this (drawn from physics, chemistry, biology, systems, mathematics, economics, art, and more)

@carnage4life LLMs *will* become intelligent <end sarcasm>