The Sunk Cost Trap

The hardest part of leaving is sunk cost fallacy — the pull to keep going just because you have already poured in time, money, or effort. "I have been here five years, I cannot quit now." But those five years are spent no matter what you do next.

The day-one test quietly deletes the past from the math. You stop paying for yesterday twice — once when you spent the time, and again every day you stay only to honor it.