Plot the goods in a graph with realness on the horizontal axis and (relative) exclusion cost on the vertical axis. (1) 1000 pounds of compacted scrap steel; (2) 1/2 ton of compacted scrap steel; (3) a mahogany tree in an inaccessible Central American rain forest; (4) a mahogany tree next to a new highway through a Central American rain forest; (5) service provided by a nearly empty city bus on its daily route.