Use the following to answer question:
Figure: Efficiency and Pollution 
-(Figure: Efficiency and Pollution) Use Figure: Efficiency and Pollution.Assume that firms are the only beneficiaries of pollution and that costs are borne solely by others in the society.An optimal Pigouvian tax of _____ per ton of pollution can move this market to the socially optimal quantity of pollution.
Definitions:
Puerto Ricans
A term referring to people who are citizens of Puerto Rico or those of Puerto Rican descent.
Two-Way Tables
Two-way tables categorize data into two dimensions, helping to analyze the relationship between two categorical variables.
Null Hypothesis
A default statement that there is no effect or no difference, used as a starting point for statistical hypothesis testing.
Degrees of Freedom
The number of independent values or quantities which can be assigned to a statistical distribution.
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