Credit cards didn't exist 1000 years ago. We aren't debating about credit systems. And yes, people walked around with shiny pieces of metal in their pocket that they used for transactions for thousands of years. At some point after the printing press was invented, the move to paper currency occurred.
Well, the parent post was saying that people were initially hesitant to move to credit systems, so I'm confused. :)
If we're talking specifically about credit cards, the credit card went from new invention to ubiquity in a couple of decades. But I think that's too narrow a scope to look at, to be honest.
Early credit systems did not depend upon the printing press; think of the widespread use of tally sticks in medieval Europe to enable illiterate low-technology credit systems.
It's really hard to approach this anthropologically, IMO, because so many other variables change. Less complex economies do fine with "local communism" and person-to-person debt, but it's hard to imagine using such a thing to order from Amazon. Conversely, coinage historically was useful if you had to exchange with someone with whom you didn't have a personal relationship (say, you're traveling to a faraway land and you can't just provide an IOU), but that's somewhat obsolete now.
I guess my conclusion would be that these historical analogies don't shed a lot of light.
