In the above figure, what is total profit at the profit-maximizing point?

In the short run, a perfectly competitive firm's economic profits

A) must equal zero, that is, the firm earns a normal profit. B) must be positive. C) might be positive, negative (an economic loss), or zero (a normal profit). D) must be negative, that is the firm must incur an economic loss.

When supply and demand for a product decrease simultaneously, we

A) can predict that both equilibrium price and quantity will increase. B) can predict that both equilibrium price and quantity will decrease. C) cannot predict equilibrium price, but know that equilibrium quantity will decrease. D) cannot predict the change in either the equilibrium quantity or equilibrium price.