Question: Economist B. Peter Pashigian: It is widely thought that environmental controls are guided by the public-spirited ideal of correcting for "negative externalities"-the pollution costs that spill over from private operations. This view is not wrong by any means. But it is suspiciously incomplete. After all, there are numerous studies of regulatory programs in other fields that show how private interests have used public powers for their own enrichment. 98 In addition to correcting negative externalities, what forces might be influencing federal pollution control?