[econophile]

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I know what you are saying, but so far i have seen nothing to conclude that outgoing rates must be greater than incoming rates. Even if this is not occuring today, i still don't understand why it couldn't happen at some point,

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there's no law that says that number of dollar bills being taken out of circulation (going into banks) has to exceed the number of dollar bills coming into circulation at any given time. but if the outflow exceeds the inflow for too long, there won't be enough dollar bills to carry out cash transactions, and then all retailers (even your uncle's dunkin donuts) will go to the bank to get more dollar bills.