Quote from Daal:
I fail to see how raising the IOR will prevent the money supply from rising creating a inflationary spiral. Lets say they hike from 0.25 to 1%, lending interest rates should rise by a similar amount(why wouldn't they), maintaining the spread, thus the banks will be exposed to the same amount of profit potential before or after the hike. UST bill yields will also rise, creating the possibility that banks would switch from deposits at the fed to USTs, likely increasing M2 in the process
This tatic will only work if the spread contracts for whatever reason, that is if lending rates do not adjust
It is an interesting point you make that Fed funds an IOR are essentially pegged to each other. Any banker who has to make choice to lend to the Fed vs. the Fed Funds market will take a higher IOR rate versus a lower Fed funds rate. The bank Fed funds bid will disappear if Fed pays higher IOR than Fed funds.
Which means that if the Fed were to lend at different rates on Fed Funds (lets say .25%) and 1.25% with IOR, it would have to actually print more money to keep a gap going (since no banker in their right mind would take .25% over 1.25%). This would keep an arb opportunity going where the bank can borrow from the Fed funds market (discount window in disguise) at .25% and lend it back to the Fed at 1.25%. Doubt they'll let that happen, simply because it actually ramps -up- money supply. Let's pick an absurdly wide tightening: 8% interest on reserves against 1% fed funds. No bank will bid at less than 8% on fed funds when it can loan to the Fed at 8%. So then Fed will have to fill the gap and provide an unlimited bid for the Fed funds market to accomodate an enormous risk free arb demand. To me, this looks more like an underhanded way to recapitalize banks.
And no way the Fed raises short term rates to 8% amid this type of job market. Remember also, that if they raise rates like this, they are effectively increasing the duration of their 1T+ agency MBS portfolio to 20+ yrs. Essentially helping with self-reinforcing inflation expectations (now that the money supply will be permanent).
The more I think about it, the Fed may not have as much control over this as they are expecting. A dump of agency MBS and/or a one time inflationary move may be just what comes out of this (likely the latter).
Conclusions:
1) IOR and Fed Funds rate are two rates that must implicitly remain relatively the same, otherwise an arb opportunity will be created that increases money supply and recapitalizes banks.
2) Because of this, any large increase in IOR (to ratchet down the money multiplier) will force Fed funds up (OR go back to #1, and result in MORE money printing and liquidity) an equal amount. That increases the permanence of the 1T+ agency MBS portfolio (as people will not prepay as early and have no incentive to refinance), as the investor required rate of return on this portfolio will also rise.
3) (disclaimer: not a banker, so correct me if I'm wrong about this

How will reverse repos be possible far away from market interest rates? If done en masse, it may send a signal to banks to raise the rates they are willing to take for lending cash. Extreme example, a banker lending its cash overnight will not take .25% or 1% if it knows the Fed might come in and pay 4% (or some other rate) on that money. I imagine reverse repo and fed funds (and thus IOR) are intrinsically tied together, and any large deviation or expectation in either will result in an arb (which ends up again having unexpected expectations of increased money supply, as Fed funds may stay fixed). ie, expectations of the substantial Fed involvement in the reverse repo market will likely drive the the rate further from Fed funds rate, maybe even making it illiquid and an unattractive source of funds (ie, why would a bank borrow at 3% on the reverse repo when it can borrow from other sources for less $$$? I imagine it would put pressure on Fed funds to rise and/or force the Fed to print more $$$ to keep it pegged. Now I am not taking into account collateral restrictions and Fed funds borrowing limitations, so perhaps someone more familiar with this can correct me or introduce more reality into my points.)