Refer to the accompanying figure. 
In the figure, which interval represents a business cycle recession?
Definitions:
Pollution Authority
An organization or regulatory body responsible for controlling or reducing pollution to protect the environment.
Tradable Permits
A system where rights to emit pollution or other substances are given a market value and can be bought and sold.
Environmental Protection Agency
A U.S. federal agency responsible for creating and enforcing regulations to protect the environment and public health from pollution and hazardous substances.
Clean Air
The condition of the atmosphere when it is free from pollutants, contaminants, and other harmful substances.
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