document.write( "Question 672249: Groucho and Harpo work together in the same office. Groucho smokes; Harpo hates smoke.
\n" ); document.write( "Groucho currently smokes 12 cigars per day. He faces marginal costs (withdrawal pains) of
\n" ); document.write( "reducing smoking equal to $x where x is the number of cigars reduced (not smoked). In other
\n" ); document.write( "words, Groucho’s marginal cost of smoke abatement is: MC = x. Harpo receives marginal
\n" ); document.write( "benefits (reduced discomfort and improved health) equal to $(12-x) when Groucho reduces
\n" ); document.write( "his cigar smoking. In other words, Harpo’s marginal benefit from smoke abatement is:
\n" ); document.write( "MB = 12-x . In addition to reducing the number of cigars smoked in the office, it is possible
\n" ); document.write( "to rent an air purifier that reduces smoke in the air by 50% for $10 per day. It is also possible
\n" ); document.write( "to rent a separate office for Harpo so he does not have to breathe any smoke for $40 per day. \r
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\n" ); document.write( "\n" ); document.write( "a. Draw a diagram showing the marginal costs and benefits of pollution reduction with the
\n" ); document.write( "number of cigars reduced on the horizontal axis. Use this diagram to determine the
\n" ); document.write( "efficient number of cigars assuming the air purifier and office rentals are not allowed.
\n" ); document.write( "b. Suppose instead that the air purifier is installed. What is the efficient number of cigars
\n" ); document.write( "now? (Hint: the new marginal benefit curve is: MB =0.5 (12-x).
\n" ); document.write( "c. Suppose that either option (air purifier or office rental) is allowed. What is the most
\n" ); document.write( "efficient outcome: air purifier rental, office rental, or neither?
\n" ); document.write( "d. What would be the outcome (number of cigars smoked, if any; air purifier or office
\n" ); document.write( "rental, if any) if Groucho and Harpo’s boss were to declare the office a non-smoking area
\n" ); document.write( "but allow them to negotiate a mutually agreeable solution? What would happen if
\n" ); document.write( "Groucho were granted the right to smoke and then negotiations were permitted? (Hint: if
\n" ); document.write( "you properly invoke the Coase Theorem you do not need to perform any additional
\n" ); document.write( "calculations to answer these two questions). \r
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\n" ); document.write( "\n" ); document.write( "Here is what I did:
\n" ); document.write( "a.
\n" ); document.write( "MC = MB
\n" ); document.write( "MC = x
\n" ); document.write( "MB = 12-x\r
\n" ); document.write( "\n" ); document.write( "so: x = 6 cigars\r
\n" ); document.write( "\n" ); document.write( "b. 6-0.5x = x
\n" ); document.write( "x = 4 cigars\r
\n" ); document.write( "\n" ); document.write( "c. Air purifier 50% costs: $10\r
\n" ); document.write( "\n" ); document.write( "MB = integral 6 to 0 (12-x) plus integral 12 to 0 (6-0.5x).
\n" ); document.write( "Net benefit = 63\r
\n" ); document.write( "\n" ); document.write( "but neither.\r
\n" ); document.write( "\n" ); document.write( "d. NO IDEA.\r
\n" ); document.write( "\n" ); document.write( "Please help!\r
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\n" ); document.write( "

Algebra.Com's Answer #417872 by MathLover1(20849)\"\" \"About 
You can put this solution on YOUR website!
Here's the graph: \r
\n" ); document.write( "\n" ); document.write( "see image 1.
\n" ); document.write( "W3C Web site \r
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\n" ); document.write( "\n" ); document.write( "First note that with no law against smoking, Groucho will smoke \"12\" cigars a day, since smoking any less is costly to him. It is evident from the graph that the efficient level of smoking equals \"6\" cigars.
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\n" ); document.write( "Alternately, since the efficient outcome will occur where \"MC=MB\", you can solve the two equations for \"x\": \r
\n" ); document.write( "\n" ); document.write( "\"MC=x\" \r
\n" ); document.write( "\n" ); document.write( "\"MB=12-x\"
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\n" ); document.write( "\"MC=MB\" => \"1x=12-x\" => \"2x=12\" => \"x=6\" \r
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\n" ); document.write( "\n" ); document.write( "2. The clean air machine,by reducing the smoke from each cigar, also reduces
\n" ); document.write( "the marginal benefits of clean-up by half for each cigar reduced. Thus for the first cigar reduced, the benefits are \"6\" (not \"12\") and for the second they are \"5.5\", not \"11\". \r
\n" ); document.write( "\n" ); document.write( "This new \"MB\" schedule changes the graph to look like:\r
\n" ); document.write( "\n" ); document.write( "see image 2.
\n" ); document.write( "W3C Web site \r
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\n" ); document.write( "\n" ); document.write( "Now, the efficient level of cigars reduced is \"4\", with \"8\" smoked. Algebraically, the new \"MB\" schedule is \"MB=6-x%2F2\", so now: \r
\n" ); document.write( "\n" ); document.write( "\"MC=MB\" => \"1x=6-x%2F2\" => \"3x%2F2=6\" =>\"3x=12\" => \"x=4\"\r
\n" ); document.write( "\n" ); document.write( "3. We know that with machine rental, \"4\" cigars will be reduced. Suppose
\n" ); document.write( "Groucho has the right to smoke, and so the status quo has him smoking \"12\" a day. \r
\n" ); document.write( "\n" ); document.write( "Harpo has three choices: \r
\n" ); document.write( "\n" ); document.write( "a. \"not\"\"+rent\" the\"+machine\" and not relocate Groucho,\"but\"\"+pay\" Groucho \"not\"\"+to\"\"+smoke\"
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\n" ); document.write( "b. \"rent\" the machine and \"then\" pay Groucho not to smoke
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\n" ); document.write( "c. \"pay\" to \"relocate\" Groucho \r
\n" ); document.write( "\n" ); document.write( "Which would he choose? \r
\n" ); document.write( "\n" ); document.write( "Not renting the machine requires Harpo tocompensate Groucho for the \"MC+\"
\n" ); document.write( "of reducing cigars: \"1%2B2%2B3%2B4%2B5%2B6=+2dollars_in_costs\". Harpo’s benefits are
\n" ); document.write( "\"12%2B11%2B10%2B9%2B8%2B7=57\" dollars, so net benefits are \"57-21=36\" dollars.\r
\n" ); document.write( "\n" ); document.write( "Machine rental costs $\"10\", plus Harpo has to pay Groucho at least his \"MC\" of reduction for the first four cigarettes. The costs of machine rental are thus:
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\n" ); document.write( "\"10%2B1%2B2%2B3%2B4=20\" \r
\n" ); document.write( "\n" ); document.write( "Relative to the status quo of \"12\" cigars smoked, the benefits of machine
\n" ); document.write( "rental have two components. \r
\n" ); document.write( "\n" ); document.write( "First, Brittany gets the full benefits of seeing \"4\" cigarettes reduced:\r
\n" ); document.write( "\n" ); document.write( "\"12%2B11%2B10%2B9=42\" \r
\n" ); document.write( "\n" ); document.write( "Second, she gets the \"50\"% improvement in air quality for the remaining \"+8\" cigars that are smoked:
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\n" ); document.write( "\"4%2B3.5%2B3%2B2.5%2B2%2B1.5%2B1%2B.5=18\" dollars \r
\n" ); document.write( "\n" ); document.write( "So, net benefits are \"42%2B18-20=+40\" dollars\r
\n" ); document.write( "\n" ); document.write( "Finally, relocation costs $\"40\", and brings Harpo the total area under the
\n" ); document.write( "\"MB+\" curve in benefits. (Since Groucho can smoke all he wants after relocation, he bears no costs). Therefore, the net benefits to Harpo of paying for relocation are:
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\n" ); document.write( "$\"%2812%2B11%2B10%2B9%2B8%2B7%2B6%2B5%2B4%2B3%2B2%2B1%29-40+=38\" \r
\n" ); document.write( "\n" ); document.write( "So the \"efficient\"\"+choice\" is machine \"rental\".
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\n" ); document.write( "4. Rather than be banished, Groucho would rent the machine, then pay Harpo
\n" ); document.write( "to allow him to stayand smoke \"8\" cigars. If Groucho rents the machine, he would pay the following costs: \r
\n" ); document.write( "\n" ); document.write( "$\"10\" for machine rental, plus\r
\n" ); document.write( "\n" ); document.write( "$\"1%2B2%2B3%2B4=10\" in nicotine \r
\n" ); document.write( "\n" ); document.write( "withdrawals on \"4\" cigars given up, plus $\"4%2B3.5%2B3%2B2.5%2B2%2B1.5%2B1%2B.5=18\" in bribes to Harpo to allow him to smoke \"8\" cigarettes \r
\n" ); document.write( "\n" ); document.write( "The total is $\"38\", less than the $\"40\" required to relocate. \r
\n" ); document.write( "\n" ); document.write( "So rather than banish Groucho,Harpo could come out ahead by demanding a little more than the $\"18\" just necessary for him to allow Groucho to smoke his \"8\" cigars. \r
\n" ); document.write( "\n" ); document.write( "This again demonstrates the Coase theorem: in the absence of transaction costs,
\n" ); document.write( "efficient outcomes will be achieved regardless of the initial distribution of property
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