So yes, fractional reserve banking can be practiced with bitcoin in the same way in which it was for gold.
Yes, this is true. But that's still called fractional reserve banking.
It's something that's different from actually printing
new money, but it shares some characteristics.
You are of course right - this kind of FRB where all we are creating is IOUs can be done with anything by anybody. But there is a catch - one which makes "real" banking FRB far more sinister. An example:
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Let's say you lend me 100 USD, and I give an IOU in return. Have we created new USD? No. Theres still 100 USD (and an IOU which is NOT USD).
Then I can re-lend, or spend the 100 (actual) USD - and you can, maybe sell my IOU to someone for, say 90 (real) USD (assuming a 90% probability that I'll hounor my debt to the holder of the IOU). Have we now created any USD? No. There is still only the original USD plus an IOU in circulation, and that IOU looks nothing like a 100 USD bill.
Contrast that to me lending that 100 USD in a bank:
I go into the bank and sign an IOU for 100 USD to the bank and the bank writes up the balance in my account by 100 USD. (Notice that in this case the bank did not need a single USD of pre-exisiting money to do so - unlike the previous case. The money came from thin air.) For legal reasons, then the bank then promptly sells my IOU to a third party which completes the monetizization process creating 100 brand new USD.
The outcome: I get 100 real, legal USD - which I can get in an ATM as a nice bill and which is legal tender for all debts, public and private. The bank gets an IOU for 100 USD from the third party, and the third party gets my IOU.
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You see the difference? Banks use the legal tender laws and the UCC laws (re-sale of the IOU "in good faith") to legally turn my IOU into real USD.
Without the bank's trick, you and I can only create IOUs - not real USD. This is the banks legal monopoly on money creation. This is the important step in FRB. Not the creation of the initial IOU.
Therefore, it does not matter if mtgox issued 1E9 worth of bitcoins in vouchers - there would still only be about 9E6 (real) bitcoins circulating, but if BOA issues 1E9 USD in "loans" the total amount of (real) USD in the world increases by that amount.
The difference is crucial - and perhaps not understood by whomever wrote the wiki.