To take your even more specific example of delivery trucks, someone has got to deliver the food that everyone eats. You can't arbitrarily assign the total resul

To take your even more specific example of delivery trucks, someone has got to deliver the food that everyone eats. You can't arbitrarily assign the total resultant negative externalities to whichever companies own and operate them. Why not? There's a big difference between retail and food, especially in the US. Food can be grown and delivered locally, and agriculture can be optimized for certain climates. Retail products, however, almost always require far more distance had between the producer and the consumer. Roads are a great example, because even after that cargo hold of plastic GI Joes "Made in China" lands on the coast, Wal-Mart trucks still have to drive hundreds or thousands of miles get the product delivered to its target consumers in rural "agriculture" lands on the interior of the US. Wal-Mart is the extreme example, but if I remember from my MBA classes, it's fairly simple to point out where the company has exploited almost everything it could legally exploit. It undercuts competitors in almost every one of its new locations; predatory pricing puts mom-and-pop shops out of business. How is this a good thing?