Georgina decides to take a dozen cupcakes to school to sell so she can raise money for her school trip to New Orleans. She prices the cupcakes at $0.50 each. With in 15 minutes she has sold all of her cupcakes, and through out the day teachers and students ask her if she has anymore.

This market model is in a [______]?
This is for a economics class I didn't know what catagory to pick