Urban Legend has it that one of the first programers to write code for a bank decided to have the program deposit all of those rounded off fractions of a cent into his personal account. Frist he was rich then he was in jail.
I am not sure how it could have an effect on the economy, after all it is not "created" money it is simply accurate book keeping.
A friend of mine is really into economics. He was telling me that when computer systems started providing virtually immediate updates to banking transactions, hundreds of billions of dollars simply disappeared from the US economy. I have no idea to what extent this affected the world economy. This was not due to round off; it was due to dwell time. When the world ran on paper, a tremendous amount of false wealth existed due to debt that was floating - much like floating a check. The delay of days or even weeks became a standard. The money people knew how to use this to their advantage.
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