Giuseppe's Pizza is a perfectly competitive firm. The firm's costs are shown in the table above. If the market price is $20, what is Giuseppe's profit-maximizing output?

For each of the following pairs of products, state which are complements, which are substitutes, and which are unrelated

a. House plants and potato chips b. Eyeglasses and contact lenses c. Motorcycles and gasoline d. Smartphones and smartphone apps e. Red wine and white wine

If homeowners purchased a $250,000 home with a zero-down, interest-only mortgage, and the value of the home subsequently fell to $200,000, the homeowners' equity in the home would be approximately

A. $200,000. B. -$50,000. C. zero. D. $50,000.