brewer,
I've read the research. I am, however, highly skeptical of research produced by people trying to sell me something (e.g. Greer/PIMCO). The research also runs contrary to my understanding of how futures work (they are not insurance products) and my observations (most commodities under perform inflation for long periods of time), which only increases my skepticism.
Greer completely dismisses the traditional “cost of carry” model for pricing futures contracts without so much as an explanation. He constructs an elaborate example around cattle futures, but does not explain why the constraints in that market should apply to metals, agriculture, and energy.
If the cost of carry model holds, then the interest accrued from “collateralization” simply compensates for the cost of carry imbedded in the futures contract. Buying a 1 year forward contract for gold and buying an equivalent notional amount of 1 year treasuries should yield the same result as buying the gold outright. Any other outcome means arbitrage profits are available for the taking.
I’ve read other research suggesting that long-dated futures contracts do have some “insurance premium” built in because of a lopsided market for sellers and buyers. The research focused on trading strategies to extract that premium. I can only assume that whatever premium existed in the past, if one ever existed at all, is rapidly being arbitraged away.
In any event, these sources of returns over and above the return generated by the underlying commodity must be pretty generous to offset the horrible inflation adjusted returns of commodities (as shown below). Greer says they are, but I can't prove / observe that.
Here are some examples of commodity performance for your viewing pleasure:
In all cases the white line is the commodity and the green line is the CPI index. The differing time periods reflect the limitations of Bloomberg's historic data.
1) Gold
2) Copper (would have been better off burying your cash in mason jars)
3) Soy beans (not any better)
4) Oil (energy commodities are the only ones that seem to track inflation well)
5) Here is a comparison of the S&P 500, 30-Year Treasury Bond and DJAIG
Good luck to everyone!