Use the following to answer questions: 
-(Table: Externalities from Parks) The table Externalities from Parks shows the marginal social benefit and the marginal social cost of preserving various amounts of land in a city for a public park. If the government wants to achieve the optimum amount of land for the park, it could use a Pigouvian _____ of _____.
Definitions:
Interest Rate Swap
A financial contract between two parties to exchange interest rate payments on a specified principal amount, often used to manage risk or alter interest rate exposure.
Floating Rate
An interest rate that fluctuates over time with the market or an index.
Fixed Rate
An interest rate that remains unchanged throughout the entire term of the loan, mortgage, or bond.
Derivative Security
A financial security whose value is dependent upon or derived from one or more underlying assets.
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