Identify whether the market supply curve will shift right or left or will stay the same for the following:

a. Firms in an industry are required to pay a fine for their carbon dioxide emissions.

b. Companies are sued for polluting the water in a river.

c. Power plants in a specific city are not required to address the impact of their air quality emissions.

d. Companies that use fracking to remove oil and gas from rock are required to clean up the damage.