The guys talk substitute goods in the car.

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

Stringer Bell learns about product elasticity and then explains it to the gangsters he is in business with.

Harold, a tax auditor, visits Miss Pascal at her store to audit her because she paid only 78% of her taxes for the year. She gives him a hard time and states that she intentionally did not pay taxes for spending that she does not support. Miss Pascal mentions some ways that the government spends taxes.

Describes what taxes are and what they are used for. This music video also mentions the different types of taxes.