Can you even conceive of how radically different that would look? In order for barter to be possible, you must be face-to-face with the person you are exchanging goods with. Unless Amazon really stepped up to the plate and hired agents in every neighborhood in the nation, I couldn't see it being anything but a reversion of society to pre-Industrial-Era structures.
Shit. You just made me realize something. This would be bliss and perfection and salvation for the current status quo. The Internet has come along and taken distribution, the source of basically every existing accumulation of significant wealth, and made it a worthless problem to solve. It took the primary economic engine, something only huge sophisticated organizations were capable of accomplishing with any effectiveness, and turned it into something any clever 12 year old can do in their spare time for a lark and run circles around those large organizations whose pre-existing distribution chains are now a weight drowning them.
They feel that noose tightening and know their days are numbered unless they can stop things from progressing any further. The death of any not-in-person transactions, especially any transactions over the Internet, would give them rebirth. Their distribution networks would once again be the single most valuable structure in the entire economy. They could continue to skim 90% of every transaction between creator and consumer for performing the long-valued task of distribution.
Shit.