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