Refer to the table below. Which of the following statements is/are correct?

I. If the price per pizza is $3, we expect the price to increase because there is an excess supply in the market.

II. If the price per pizza is $6, there is an excess demand of 300 units.

III. In this market, there will be an excess supply of 500 pizzas at a price of $16.

IV. The seller's revenue in an unregulated market is higher than in any regulated market.