Nice article- however, a slight correction. Sunk Cost Theory states that when making decisions ignore sunk costs, and defines sunk costs as those costs which are unrecoverable. Therefore, your time is always unrecoverable. However, you mention that the investments one has made in his or her life aren’t worth anything – I think this is misleading, as any investments in things like reputation, or refining one’s mental models can be recovered. In addition, Sunk Cost theory says to ignore sunk costs, not that all of your sunk costs were wrongly created – the theory is about assessing your current state and making the best decision, not ignoring the past completely.