Refer to the graph shown. Assuming a $0.10-per-gallon marginal cost external to the trade that is associated with gasoline, the market price of gasoline necessary to induce consumers to purchase the efficient quantity each year is: 
Definitions:
Ethical Wicked Problems
Complex ethical dilemmas that are difficult to solve due to incomplete, contradictory, and changing requirements.
Green Consumer
A consumer who is particularly interested in products and services that are environmentally friendly.
Ethical Approach
A method or strategy that prioritizes moral principles and values in decision-making processes.
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