I was noodling with my rough spreadsheet that has inflation rate and investment return rate. Usually I set it to provide a real rate of return of about -2%, say inflation 5% investment return 3%. That used to get me up into my early 90's, say 30 years.
Lately I have tried setting the variables to something like inflation 12% and investment return 10%. I noticed that this real rate of return of -2% is not necessarily the same as the 5%/3% -2% real rate. It seems to cut off a few years of survival.
In any case, it is striking me that if we have persistent inflation anywhere close to what we are currently having, I will have problems unless I can jack up my investment rate of return to at least the inflation rate.
I am going to look into TIPS. Right now, about 14% of my portfolio is in series I savings bonds and I have been happy to see the nice return.
Tips and i bonds are very different…tips are down and not very good deals.
Numbers in a spreadsheet do not tell you about political risk that often comes with high inflation. You have to use some intuition and historical extrapolation to guess what results from high inflation and why you don't want to use TIPS.
1) High inflation is a political problem in almost every case. The people causing the inflation know they are doing it.
2) Because high inflation is unpopular with the masses, the people in charge are always going to lie about it as long as possible to deflect blame.
3) Then when lying doesn't work, they will implement policies like price controls to make it look like they are doing something. This always makes it worse.
4) Along the way, they will manipulate economic numbers to try to trick the markets. However the markets are much smarter than the typical politician, who is usually an idiot based on my experience.
But these things are not going to show up in Excel. There is no ("IDIOT POLITICIAN ) function you can call. There is no way for you to anticipate what actions they will take to lie about the situation. And, there is no way for you to know how the markets are going to react to the mess.
I will only suggest that the markets will figure out the right thing to do and that right thing usually is not relying on government numbers about inflation.
so tips are like buying fire insurance from an arsonist
Or you can simply go back and read Nixon's, Ford's and Carter's speeches about inflation in the 1970s. It was lie after lie after lie. A decade of lies.
TIPS may be OK for the cash portion of the portfolio. But I wouldn't rely on them in the slightest for protection against high inflation. For lower inflation the bonds and stocks are all you need.