Penny and Sheldon specialize in portions of the production of Penny Blossoms. Raj, Leonard, and Howard introduce their specialties to the process in an effort to increase the supply of Penny Blossoms from improvements in technology.
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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.