Many observers believe that the levels of pollution in our society are too high. true or false: if society wishes to reduce overall pollution by a certain amount, it is efficient to have firms with highest profit bearing the largest burden of reducing pollution and firms with lowest profit bearing the least burden.
a. true
b. false
which of the following statements is true about command-and-control approaches to reducing pollutions? check all that apply.
a. command-and-control approaches often rely on uniform reductions among firms
b. command-and-control approaches are efficient because they ensure each firm reduces the mandated amount of pollution.
c. command-and-control approaches are generally unable to target the firms that should undertake bigger reductions.

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening.a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number.include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i.e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?