Even though his ringtone purchase is a sunk cost, Leonard is unable to rationally select a new ringtone. He feels that having spent $3 on a ringtone requires that he use it, even if he doesn't like it.
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Even though his ringtone purchase is a sunk cost, Leonard is unable to rationally select a new ringtone.
Penny starts a business selling hair barrettes and begins discussing her production capacity and revenue from a single day of work.