Shoes as a Normal Good

When Sheldon alerts Penny that she'll earn over $3,000 for a single night of work, she imemdiately goes to buy shoes.

Specialization in Penny Blossom Production

Penny and Sheldon specialize in portions of the production of Penny Blossoms.

Sheldon introduces to Penny the notion of the assembly line.

Sheldon calculates out Penny's per-day wage and makes a comment that children in Indonesia make more money than she would.

Penny starts a business selling hair barrettes and begins discussing her production capacity and revenue from a single day of work.

Sheldon asks Penny to sign for a package from UPS because he would like to transfer property rights back to her.

Sheldon doesn't trust Penny's dry cleaner because he also makes keys.

After Penny borrows money from Sheldon to help pay rent, Leonard tries to help identify methods to save money.

Barry Kripke controls a piece of lab equipment that Sheldon needs to complete his experiments.

Raj tries to use transitivity to announce that the even the worst tapioca pudding is better than the best pudding of any other flavor.