Snapshot · SOLVED with Mark Manson
A study using Rusbult's investment model on 50,000 people found that investment size — time, emotional energy, money — predicts whether someone stays in a relationship even more strongly than relationship satisfaction.
Where this was said
At 1:02:20 · chapter starts 1:01:00
Manson introduces the sunk cost fallacy through the classic movie ticket analogy: staying for a film you hate because you paid for the ticket, when the money is already spent regardless. In relationships, the logic plays out over years and decades — 'I've already been with them for 8 years, what's another year or two?' Drew cites a striking empirical finding: a large study of approximately 50,000 people using Rusbult's investment model found that investment size — time, emotional energy, money — predicts whether someone stays in a relationship above and beyond their actual satisfaction [1] — Drew Birnie "The sunk cost fallacy is the $15 movie ticket problem applied to your love life. A study of 50,000 people found that investment size — time…" 1:00:25 . This means people will endure profound misery simply because they've sunk so much into the relationship. Manson adds a cruel irony: the cost of leaving only increases the longer you stay, because identity merges further and the investment compounds. The trap is also vicious because toxic relationships force you to give up friends, hobbies, and other parts of your life to placate your partner — which then creates additional sunk cost that further locks you in. Drew describes the '2018 study' finding that people frame staying-and-fighting as active and virtuous, while leaving is experienced as passive failure — which causes them to double down rather than exit.
The cost of leaving a bad relationship only increases the longer someone stays, because identity merges further and investment compounds — making the exit harder at every subsequent moment.
People in the worst relationships feel the most guilt — blaming themselves for staying, then feeling guilty for even wanting to leave. Amber's 'savior guilt' kept her convinced she was the only thing keeping Johnny alive. Enabling bad behavior does not save the other person. It holds them back from the transformation they actually need.
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Cognitive neuroscience literature shows that by age 6, humans can recognize tens of thousands of different object categories — far more data than early AI systems were trained on.
Only about 3% of FDA-approved drugs have genuinely unclear mechanisms of action, making an unknown mechanism a meaningful early red flag for any compound.
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