What, exactly, do you think is "deadly" about bond funds?MachineGhost wrote:Don't confuse short term Treasury debt with zero duration currency. I would have preferred if 1-year T-Bills were available because the ST Treasury fund actually has a duration of about 2.3 years. Duration differences can matter a lot in tightening cycles or other sensitive climates.jafs wrote: It seems extremely counter-intuitive that a very cash heavy portfolio would be the best way to beat inflation.
In reality we would just ladder/stack the cash in individual 5-year CD's to get the best of all worlds anyway. Bond funds are deadly.
A bond fund with a constant duration is the same as a continuously rolling ladder of the same duration. So, if you ladder 5 year bonds, a fund that invests in 5 year bonds will be the same. In an environment of rising rates, the current value of the ladder and the fund will drop by the same amount, and you will also recoup your principal in the same amount of time.
Holding bonds to maturity is not some magic get-out-of-jail free card that lets you avoid principal loss if interest rates go up. If rates go up, the current value of your holdings goes down - whether you're holding a ladder or a bond fund makes no difference whatsoever. With a rolling ladder when your bond matures you "recoup" the face value, but that bond had a declining, shorter than your average, duration that is offset (in your ladder) by other bonds that have a longer than your average duration. If rates went up, the nearly mature bonds in your ladder didn't drop in value very much but the newest bonds in your ladder (furthest from mature) dropped more than your overall ladder. You don't see this same effect with a bond fund (because they concentrate their holdings at a specific duration), but the overall impact of a rate change is essentially the same.
This is perhaps somewhat counter intuitive. Nonetheless, it's true. For more on this, see https://www.bogleheads.org/wiki/Individ ... _bond_fund .