The Gold Medal Gold Model

By David Merkel of 

Eddy Elfenbein is a clever guy; he put together a model of gold prices that fits the data very well.  Tonight, I will share my own variation on the model, and try to give an intuitive explanation of why it works.

Ask yourself this: where does investor put his money if he wants to stay safe?  Most people are savers not investors, so ideally they would want to put their money on deposit and earn a real return with the ability to access their money at any time.  Then there is the alternative asset, gold.  Gold is a hedge against inflation, but it throws off no interest.  But at some level of real return, savers begin to conclude that they aren’t earning all that much, so they may as well hold gold.  Vice versa when real rates rise.

One more thing: gold doesn’t benefit from productivity increases, as stocks do.  Rapidly increasing productivity makes gold less attractive than stocks.

Eddy’s model boils down to this (in my implementation):

Percentage change in gold price = Multiplier * Percentage change in (Deflator Index / Real return Index)

where the Real Return index compounds three month T-bill yields less inflation via the 12-month CPI-U in arrears.

Here is how well the mode works, since 1970:

The first model attempts to minimize absolute dollar price differences between actual and model.  The second attempts to minimize the ratio between actual and model prices.  Both have R-squareds over 90%.

The deflator return is constant in percentage terms.  For the two models it is around 2.3%/yr, which is not far from productivity gains.

As for the multiplier, it is near six.  The multiplier is like a duration figure with bonds.  What this means is that the percentage change in real interest rates, three-month T-bills less CPI-U inflation, is projected to persist for six years.  Six years is a reasonable figure, because monetary policy changes slowly, but not glacially.

Now, at present levels of real interest rates, with T-bill yields near zero, and the CPI above 3%, it implies a gold price rising at 3% per month.  If inflation stays where it is and the Fed holds good on its promises, that means a gold price in the $3000s in mid-2013.

Do I believe this?  Partially.  I own lots of oil stocks, but nothing in metals at all.

Eddy’s model helps to clarify the value of gold.  It is a store of value, as its price anticipates the degradation and strengthening of the dollar, because changes in real rates will persist on average for six years.



About the Author

David Merkel
David J. Merkel, CFA, FSA — 2010-present, I am working on setting up my own equity asset management shop, tentatively called Aleph Investments. It is possible that I might do a joint venture with someone else if we can do more together than separately. From 2008-2010, I was the Chief Economist and Director of Research of Finacorp Securities. I did a many things for Finacorp, mainly research and analysis on a wide variety of fixed income and equity securities, and trading strategies. Until 2007, I was a senior investment analyst at Hovde Capital, responsible for analysis and valuation of investment opportunities for the FIP funds, particularly of companies in the insurance industry. I also managed the internal profit sharing and charitable endowment monies of the firm. From 2003-2007, I was a leading commentator at the investment website RealMoney.com. Back in 2003, after several years of correspondence, James Cramer invited me to write for the site, and I wrote for RealMoney on equity and bond portfolio management, macroeconomics, derivatives, quantitative strategies, insurance issues, corporate governance, etc. My specialty is looking at the interlinkages in the markets in order to understand individual markets better. I no longer contribute to RealMoney; I scaled it back because my work duties have gotten larger, and I began this blog to develop a distinct voice with a wider distribution. After three-plus year of operation, I believe I have achieved that. Prior to joining Hovde in 2003, I managed corporate bonds for Dwight Asset Management. In 1998, I joined the Mount Washington Investment Group as the Mortgage Bond and Asset Liability manager after working with Provident Mutual, AIG and Pacific Standard Life. My background as a life actuary has given me a different perspective on investing. How do you earn money without taking undue risk? How do you convey ideas about investing while showing a proper level of uncertainty on the likelihood of success? How do the various markets fit together, telling us us a broader story than any single piece? These are the themes that I will deal with in this blog. I hold bachelor’s and master’s degrees from Johns Hopkins University. In my spare time, I take care of our eight children with my wonderful wife Ruth.