Use the following to answer questions: 
-(Table: Prices and Demand) The New Orleans Saints have a monopoly on Saints logo hats. The marginal cost of producing a hat is $18. If the Saints increase the number of hats they sell from four to five, marginal revenue is:
Definitions:
Market Price
The amount at which an asset is bought or sold in the market.
Shares Outstanding
The total number of a company's shares of stock that are owned by shareholders, including those held by institutional investors and restricted shares owned by the company’s officers and insiders.
Stock Split
A corporate action in which a company divides its existing shares into multiple shares to boost the liquidity of the shares, though the total market value remains the same.
Market Price
The rate currently set for the trade of assets or services in the marketplace.
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