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“One of the most commonly cited human irrationalities is the sunk-cost fallacy, in which people continue to invest in a losing venture because of what they have invested so far rather than in anticipation of what they will gain going forward.”
― Steven Pinker, Rationality

“Treat the time spent with the wrong people as sunk-cost and move on.”
― Vikrmn: CA Vikram Verma, Debit Credit of Life: from the good books of accounts