Charlie is trying hard to lose his "spare tire" before his wedding. he has two months to get ready for the event. he decides to go about his weight loss systemically. the first week, charlie exercises vigorously. the second week, he gives up meat. the third week he drinks large amounts of water. the fourth week, he eats just bananas. he continues to vary his approach each week. at the end of his eight-week experiment, he concludes that his best weight loss comes from exercise. identify the independent and dependent variables in this scenario.

4. understanding different policy options to correct for negative externalities carbon dioxide emissions have been linked to global warming. the following table lists some possible public policies aimed at reducing the amount of carbon dioxide in the air. for each policy listed, identify whether it is a command-and-control policy (regulation), tradable permit system, corrective subsidy, or corrective tax. public policy command-and-control policy tradable permit system corrective subsidy corrective tax the government charges factories $110 for every ton of carbon dioxide they emit. the government orders every factory to adopt a new technology, which reduces carbon-dioxide emissions into the atmosphere. trees take carbon dioxide out of the air and convert it to oxygen, so the government funds a tree-planting initiative by offering $110 to any citizen who plants a tree. the government limits total carbon-dioxide emissions by all factories to 180,000 tons per month. each individual factory is given the right to emit 140 tons of carbon dioxide, and factories may buy and sell these rights in a marketplace.