Overall, it's bad to profoundly accelerate the process of industrial economy of scale, by using economic forces instead of technological ones to effect that process. In other words, Wal*Mart is bad not because it's technologically more efficient at delivering goods, but only because it's economically more efficient at doing so ... by forcing suppliers to drop prices so hard that the suppliers get caught in a cash-flow trap and either cycle out of the Wal*Mart chain or they collapse.