In a community cohabitated by two consumer groups, namely workers and retirees, a polluting factory causes PM 2.5 emissions. The total damage inflicted on workers is represented by 3p, where p denotes the pollution level (in kg PM2.5 emissions), while retirees experience a total damage of 3 times the damage experienced by the workers group. According to an assessment conducted, the factory accrues savings of 40p-5p through polluting at level p. < Determine the combined (encompassing both consumer types) marginal damage for the public nuisance. Calculate the value of marginal damage at a pollution level of 4 units. Create graphs for the marginal savings and aggregate marginal damage, with pollution depicted on the horizontal axis. In the absence of regulation or negotiation, calculate the factory's pollution level. What constitutes the society's optimal pollution level? Commencing from the uncontrolled pollution level determined in the above question, ascertain the marginal willingness to pay for pollution abatement (A) for each consumer group. Find the aggregate marginal willingness to pay for abatement. < Once again, starting from the uncontrolled pollution level, identify the firm's marginal cost of pollution abatement. Determine the optimal level of A. < Now, find any environmental economics related textbook, read about concepts of marginal costs, marginal savings, marginal damage, and pollution abatement costs and savings.