Why does opportunity cost thinking fail?

The most common reason opportunity cost thinking fails: Treating opportunity cost as a reason to never commit to anything. Analysis paralysis is not opportunity cost thinking — it's the failure mode of opportunity cost thinking. The goal is not to agonize over every alternative. It's to build the reflex of asking 'what am I giving up?' before the commitment is made, then deciding quickly. If you find yourself unable to choose because every option has costs, you've turned a decision tool into a procrastination device.

The fix: Pick one commitment you made this week — a meeting you accepted, a project you started, a purchase you made. Write down three specific things that time or money could have gone toward instead. Now honestly assess: did you consider any of those alternatives before committing? If not, you've just caught opportunity cost neglect in action. Repeat this weekly until the comparison becomes automatic.

The underlying principle is straightforward: Every choice to do X is a choice not to do Y — consider what you give up.