Yvette's Performance Pizza is a small restaurant in San Francisco that sells gluten-free pizzas. Yvette's very tiny kitchen has barely enough room for the four ovens in which her workers bake the pizzas. Yvette signed a lease obligating her to pay the rent for the four ovens for the next year. Because of this, and because Yvette's kitchen cannot fit more than four ovens, Yvette cannot change the number of ovens she uses in her production of pizzas in the short run.