Table 18-9
The following table shows the production function for a particular business. The numbers represent the various labor and output combinations the firm may choose for its output on a daily basis. 
-Refer to Table 18-9. What is the marginal product of the fourth unit of labor?
Definitions:
Price Elastic
Describes a situation where the quantity demanded or supplied of a good or service changes significantly due to changes in its price. Highly elastic means a small price change makes a big difference in demand or supply.
Quantity Demanded
The total amount of a good or service that consumers are willing and able to purchase at a particular price.
Chocolate
A sweet, typically brown food preparation of Theobroma cacao seeds, roasted and ground, often flavored, as with vanilla, and used as a confection or as a flavoring ingredient.
Price Elasticity
A measure of how much the quantity demanded of a good responds to a change in the price of that good, indicating the sensitivity of demand to price changes.
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