If ibonds went to 2% or tips went over 3.25%, I'd think about it.
.
TH, are you referring to the real rate or the total rate (inflation plus the real rate)? Want to be sure we compare apples as best as possible, even though the I or TIPS bonds are not directly comparable to other bonds.
Regarding a previous question about whether the Fed can influence long term rates, (This is not done by adjusting the spread or price at auction of long bonds, either, as the relevant long rates are the ones companies and decsionmakers face on their own corporate paper, not treasury bond prices.)
It may be time to crack out the old economics text books on Fed Open Market Policy etc., but what I remember in short is that the Fed can influence short term rates through Open Market Operations and setting the Fed Funds and Discount Rates, (forcing banks to give them cash or lend more, for example), but the long term rates are in such vast, liquid markets and quantities that the Fed cannot really move them. There is no direct mechanism, and you'd need to buy up trillions before you could have a sustained impact on interest rates, which would of course need to come from somewhere besides issuing new debt to pay for it!
The long rates are set mostly by expectations of lots of smart decision-making people (investors, credit granters (lenders), borrowers, traders) on things like inflation, relative currency strength, trade deficits, economic growth, as well as supply and demand for credit. (with a premium applied to this base rate for credit risk) That would appear to be why the Fed spends so much time trying to signal reassurance and 'jawbone' the market into keeping optimistic expectations about inflation and the like so that credit can stay cheap and the economy can keep rolling. If the Fed wants to increase long rates, they need to convince us that the economy really is going to heat up and create a future shortage of credit, or possibly on the flipside, future negatives like dollar weakness or inflation. Arencha glad you're not a central banker?
ESRBob