Clive wrote:
A point of note is how whilst gold (silver) might be a long term preserver of purchase power, when people say that they're talking very long term. In the first of the above charts you can see how if your great great grandfather had bought some precious metals in 1875 neither your grandfather or father might have seen such purchase power hedging. Only at the 1980's highs and more recently had that become true.
Yup. Whenever you read about preserving purchasing power, or any kind of asset return, ask yourself, "over what timeframe?" Edit: And then ask yourself, "how does that correlate with my needs?"
With gold or silver the numbers quoted are at best lifetime but more typically several lifetimes as you point out.
Looking at gold and silver prices over decades instead of centuries, it is easy to see how new discoveries (added supply) has caused disruption in price and hence purchasing power. It is a bit harder to see how executive fiat (e.g. alloying coinage) has had the same effect, but the evidence is there. In both cases the effect diminishes with time, but that may be time you do not have.
And that's where the permanent portfolio comes into its own. With multiple asset classes, you don't depend on a single class behaving perfectly and perfectly in time.