Please explain the concept of negative externality and answer the following questions.

1.In the Land of Purity, there is only one form of pollution, called "gunk." Table 12-18 shows possible combinations of economic output and reduction of gunk, depending on what kinds of environmental regulations are chosen.

\fQuantity Quantity supplied without Quantity supplied after Price Demanded paying the cost of pollution paying the cost of pollution $10 450 400 250 $15 440 440 290 $20 430 480 330 $25 420 520 370 $3 0 410 5 60 410