But that's not all there is to it. It really is a network phenomenon. Otherwise you wouldn't expect it to also appear in power networks:
http://iopscience.iop.org/article/10.1088/1367-2630/14/8/083...
Not surprisingly, the flow isn't large. The electricity takes many path through the circuit.
Here, too, having fewer paths would result in large flow.
See: http://physics.stackexchange.com/questions/2072/on-this-infi...