Speaking from an economics point of view, the general deal has been that there's these two interest rates: Those on deposits, and those on loans. The inflation rate is typically between the two. Banks made their money on the difference between the deposit rates and the loan rates. With competition, banks that didn't pay interest saw their working capital running away to other banks; likewise, if they charged too much interest on their loans, they'd see their income go down because people would get their loans elsewhere.
Problem was, given this environment, there was always the problem of a Run On The Bank. Banks in general don't have all
that much money lying around; most of it is loaned out. For that matter, banks actually create money. A depositor puts in, say, $1000; the bank loans out $900 of it; The owner of said loan now deposits $800 in an account at the bank, and the bank then loans out $700 of that, and 'round and 'round we go until about 10X of that original $1000 is now in circulation. Who needs a Fed to print money?
Back before the Fed was created following the Great Depression, banks were lightly regulated. My memory of Econ 101 and 102 (macro and micro economics) says that the reserve requirements were minimal; so, if a bank was stressed due to Too Darn Many Bad Loans, people who got wind of said problems would rush to their bank to Get Their Money; too much of that, with no recourse, and the bank would up and crash. There were
lots of bank failures throughout the late 1800's into the early 1900's, like, once every five or ten years, finally culminating in the Big One, the Great Depression.
At that point both the Banking Industry and the politicians (often paid for by the Banking Industry) had Had It, and the Fed was created, along with its Discount Window and designation as the Lender of Last Resort. Generally, the idea was that, come the day when a Federally Insured institution was going under because of the (traditional) Run On The Bank, the Fed would open up the discount window and start handing out loans, backed by the full faith of the U.S. Government, to any banker who showed up. Suddenly, all the depositors Had Money.. and the panics disappeared.
Now, banks going under from bad loans did (and still do) happen; the depositors are protected. But what if a bank doesn't, say, actually have anything wrong with it? They just got a bunch of antsy depositors? Well, that's what the discount window is for. Bank gets a loan, antsy depositors banished, bank pays back the loan when people put their money back in the bank, and life goes on.
But those
discount window loans were supposed to have an interest rate much higher than the interest banks were paying to their depositors. Banks didn't really want to use that discount window, if affected their profits. So far, so good.
But what happens when the Fed starts issuing zero-interest loans via bond sales? Um. Well, banks still loan out money to make money. But, suddenly, instead of getting their working capital from the hoi polloi of depositors,
they're getting working capital from the Fed. For cheaps. Free money!
That this has been going on, for crying out loud, for nearly 20 years, has been pretty darn obvious to anybody with an interest-bearing checking or savings account. 0.01% interest? Give me a break. The banks just love it and, you can bet, have been lobbying like mad to Keep Things That Way.
There's only one problem with this. Given the round-and-round effect of loans and deposits in a bank, injecting cash like this into an economy is down-right inflationary. More and more cash chasing the same amount of goods and services and, well, that's precisely how inflation gets started.
The solution is to get interest rates higher; I've been waiting 20 years for the Fed to get it's derriere in gear and start doing that. And, since raising bond interest rates and that blame discount window interest rate is precisely the main tool that Fed has to control inflation, it's no surprise that they started doing that when inflation reared its ugly head.
So: I'm glad interest rates are higher. The Fed discount window should be 2% to 5% or so; interest bearing deposit accounts should be up to several percent (Ally and others are at 4% these days) so the banks are competing for depositors again, and capitalism and Adam Smith's invisible hand will keep things on a more even course.
Zero percent interest? I sure hope not.