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Just a guess, but I would expect that it was a way to prevent savings accounts from substituting for checking accounts, from the time when checking accounts could not pay interest. (Which seems like a silly concern today when interest rates are near zero, but it wasn't that long ago that savings accounts paid a respectable 3% APR or better.) Ultimately, I believe the purpose of this line of regulation was to force customers to provide more information about their time horizons to the banks, so that the bank could maintain an appropriate level of cash on hand to meet demand. But again, that's just a guess -- but there should be plenty of information in the Federal Register for anyone who cared to do the research. 121a0012 (talk) 03:07, 10 December 2011 (UTC)Reply
the "regulatory aspects" § of the article suggest also that the fractional reserve requirement for checking accounts is greater than that for savings accounts. Banks want to keep the minimum reserve on hand; too much $ on reserve means that the cash is sitting unused, while too little $ on reserve means that the law is being violated. Therefore, banks would have a real headache maintaining the reserve at the statutory minimum if depositors moved funds back and forth between accounts. Mang (talk) 20:56, 21 June 2013 (UTC)Reply