Stuart states his salary from the comic book store.
Read MoreWhat's in a Song?
Even though his ringtone purchase is a sunk cost, Leonard is unable to rationally select a new ringtone.
Read MoreSpecialization in Penny Blossom Production
Penny and Sheldon specialize in portions of the production of Penny Blossoms.
Read MorePenny Learns About an Assembly Line
Sheldon introduces to Penny the notion of the assembly line.
Read MoreProfits for Penny Blossoms
Penny starts a business selling hair barrettes and begins discussing her production capacity and revenue from a single day of work.
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