Tuesday, December 20, 2011

Algorithmic Trading of Precious Metals

By Fred Novomestky, Ph.D

Algorithmic trading has become both a significant new trend in financial markets and for many seasoned professionals, a pariah. A closely related concept is high frequency trading. A brief check of Wikipedia gives you a concise description. There are two important characteristics of algorithmic trading which is also known as Algo, Black-Box, or Robo trading. The first is the use of electronic platforms for entering trading orders. The second is the use of algorithms or quantitative oriented decision making tools that determine the timing, pricing, or quantity of the order. Often the orders are initiated without human intervention.

Algorithmic trading has been in use for decades even before the advent of electronic financial markets. Buy side institutional investors with in house index funds have performed periodic re-balancing of their portfolios using block trading. In principle, algorithmic trading can be used for all asset classes and any investment strategy. In 2006, more than one third of all European Union and United States stock trades were driven by automatic programs. This trend is expected to continue to grow. In the words of Thomas Friedman (author of The World Is Flat) , “Access to electronic markets has contributed to leveling the playing field among institutional and individual traders.”

There is of course a dark side to automatic systems. First of all is their black box nature. Traders tend to have an intuitive view of how the world works. When pitted against numbers spewing from a mathematical model, sometimes the intuition is lost. The Flash Crash of May 6, 2010 was impacted by both algorithmic and high frequency trading.

This blog looks to evaluate the value of daily re-balancing of a portfolio that combines fully margined gold and silver futures contracts. All the previous blogs on precious metals have assumed that all portfolios are rebalanced at the end of each month. We will illustrate a very simple, transparent, and intuitive algorithm for re-balancing these two commodities. There are two underlying features of the model. The features mimic the behavior of options traders. The first is to let the profits run. As one commodity tends to do better than the other, move more capital towards that commodity. The second is to cut the losses short. When the total portfolio is losing value, lock in the profits and reduce exposures. The relative valuation is through the changes in allocation between the two commodities.

Tables 1 and 2 illustrate the strategy for the time period December 31, 1990 to January 31, 1991. On market close of December 31, 1990 the allocation to gold and future is set to equal weight just as our favorite precious metal portfolio in previous blogs. These are highlighted in the pair of columns with the label Begin Weight. These percents are applied to the portfolio value which is initially $1,000,000. The next two columns show the beginning market values of the positions. The daily returns of the gold and silver futures contract appear in the pair of columns called Total Return. These returns are applied to each of the beginning values to obtain the Gains and Losses.

Continuing with Table 2, the gains and losses are applied to the beginning values to obtain the End Values for each position and the total portfolio. A note is made if the end value of the portfolio has increased since the previous day (+1) or decreased (-1) in the Increase column. Using the end values, the End Weights as a percent of total portfolio value are computed. The next two columns show the change in the weights of the gold and futures from the begin weights to the end weights. This tells us information about the relative performance of the two commodities. For January 2, 1991 there is no change in weight due to zero returns. For January 3, 1991, the change in gold was -0.73% while the change in silver was +0.73%. This indicates that relatively speaking, silver outperformed gold. Also, with a +1 in the Increase column, the value of the portfolio increased. The Target Weights are computed using a simple formula which is [End Weight] + [Increase] * [Multiplier] * [Change in Weight]. The Multiplier amplifies the effect of the small change in exposure and the value used is 10. The New Weights are the Target Weights with a trading filter which is common in algorithmic trading. No position is allowed to go below 5% or above 95%.

We now look at two algorithmic traders. Mr. Rip Van Winkle has a program in which the equal weights are reset and the end of each year and we refer to his strategy as the Annual Re-balance. The second trader is Mr. Luna Plena and he resets the equal weights at the end of each month. We refer to his strategy as the Monthly Re-balance. Tables 3 through 6 show our standard summary statistics for the two strategies compared to our passive end of month re-balancing and the two underlying commodities. There is evidence to suggest that more frequent trading seems to add value over a simple month end re-balance.

Figures 1 through 4 are the acid test by looking a cumulative wealth starting at $100 and going through the end of each five year time period. Looks like dynamic trading works except in Figure 4. The extreme drop began in 2007 as the full effect of market turbulence took hold.

With care in the design and implementation, algorithmic trading can provide superior performance results. A caveat is that we did not include trading costs, which if not carefully managed, can take away from the benefits of algorithmic trading.


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Wednesday, December 14, 2011

Risk Alchemy with Precious Metals

By Fred Novomestky, Ph.D

Alchemy is one of those magical words that bring to mind the workings of a medieval magician or sorcerer. They would transform base metal to gold. Another interpretation of the word is “the process or power of transforming something common into something special.” In the blog Managing Downside Loss with Gold, we used the Upside Reward Downside Loss Frontier chart to both highlight the potential value of gold to both enhance reward but minimize downside loss. We also explored allocations to individual asset classes and portfolios that resulted in minimum downside loss. Let’s see how well we can transform into something special the downside loss and upside reward of portfolios of financial assets by including precious metals or gold by itself.

We maintain the same empirical framework that has been used in the past several blogs. We observe the performance results of four distinct portfolios: all stocks, all bonds, 40% stocks 60% bonds and 60% stocks and 40% bonds. These portfolios are analyzed over four non-overlapping time periods: 1991 to 1995, 1996 to 2000, 2001 to 2005 and 2006 to 2010. The basic portfolios are assumed to be passively rebalanced to the corresponding asset mixes at the beginning of each month. Tables 1 through 4 summarize the return statistics for each of the portfolios and precious metals and for each time period. The reader should refer to the blog Portfolio Strategy and Gold [include a link for this blog] to see the corresponding statistics for gold futures. The investor should be concerned about the observation that the downside loss for precious metals has been greater than most portfolios across most of the time periods.

The blog Blending Financial Assets and Precious Metals has shown that the weak or negative correlation of financial assets with precious metals can be the magic ingredient for transforming downside loss. When you look at the correlation coefficients in Table 5 that compare and contrast the correlation of the portfolio returns with both gold alone and precious metals, you get a sense of how dynamic these relationships are. Furthermore, with gold and silver equally weighted as we recommended in All That Glitters Is Not Gold, the resultant mix appears to be more correlated with the asset portfolios than gold alone.

Figures 1 through 4 present the upside reward to downside loss efficient frontiers for the four portfolios. The minimum downside loss portfolio changes over time with corresponding exposure to gold and precious metal summarized in Tables 6 and 7, respectively. The first piece of alchemy is the reduction of downside loss when asset portfolios are combined with gold and precious metals. Tables 8 and 9 summarize the effect. For example, the downside loss in Table 8 for All Stock without gold is the measure for the portfolio with 0% exposure to gold. The downside loss for All Stock with gold is the measure for the minimum downside loss portfolio. In all cases downside loss for a portfolio with gold or precious metal is less than or no worse than the downside loss for the portfolio with financial assets alone. Yet, it is hard to see the difference between gold alone and precious metals.

Let’s take a look at the effect of gold and precious metals on getting the best upside reward. Tables 10 and 11 show the allocations to gold and precious metals, respectively, that are associated with the maximum upside reward. It is disappointing to see that you either have no exposure to these commodities or convert the entire portfolio to a commodities portfolio. The problem is the static nature of the asset allocation process with the passive rebalancing to fixed exposures to financial assets and the commodities. Commodity trading advisors (CTA’s) are adept at dynamically adjusting the exposure to commodities to get the greatest value to investors. Tables 12 and 13 show the effect of our passive strategy with upside reward improving with or without the use of commodities in a rather naïve and unrealistic manner.

We’ve seen how gold and futures can transform conventional downside risk in financial asset portfolios into something special. To get the best improvement in upside reward requires a more dynamic investment strategy.


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Monday, November 28, 2011

Blending Financial Assets and Precious Metals

By Fred Novomestky, Ph.D

In my previous blog, All That Glitters Is Not Gold, I looked at the benefits and issues of long term investments in other precious metal commodities, namely, silver and platinum. The benefits of diversification were noticeable. The platinum futures market, however, is not sufficiently large to make it accessible to investors in any meaningful manner. We found on the basis of the omega measure that the Dow Jones UBS Precious Metals Index fared somewhat better than our equal weighted portfolio of gold and silver in two time periods and worst in the other two time periods. In this blog we will see what happens when you combine precious metals with financial assets using the equally weighted portfolio.

We maintain consistency with the previous blogs by using the same four, five-year time periods of 1991 to 1995, 1996 to 2000, 2001 to 2005 and 2006 to 2010. The financial assets are large capitalization stocks, small capitalization stocks, long term government bonds, intermediate term government bonds and long term corporate bonds as computed by Ibbotson and Associates. Tables 1 to 4 contain monthly return statistics for the five asset classes, precious metals and gold futures. Gold futures were contrasted to financial assets in the blog Asset Allocation and Gold. The statistics are mean, volatility (i.e. standard deviation of returns), minimum, maximum, downside probability, downside loss downside volatility, upside probability, upside reward, upside volatility and omega measure. The upside and downside statistics are partial moments which are introduced in the blog Partial Moments – the Up and Down of Performance and Risk. Omega measure is the ratio of upside reward to downside loss.

On the basis of omega measure, most financial assets outperform precious metals and gold futures. The exception is 2006 to 2010. One has to ask if it pays to combine these commodities with financial assets. Tables 5 and 6 provide a partial answer. Table 5 presents the correlation of precious metals and financial assets while Table 6 highlights the correlations of gold with financial assets. Generally speaking, both gold and precious metals have weak positive or negative correlations with financial assets. Precious metals, as a portfolio, tend to have even more negative or weaker positive correlations. This provides an opportunity to further diversify risk.

In Asset Allocation and Gold we presented omega frontier charts that show the effect of different mixes of gold and financial assets on the omega measure. These charts are not used here as they tend to have the same appearance and do not reveal information on impact of using precious metals instead of gold as a diversifying investment. Instead, we introduce a new style of analysis in Tables 7 to 11. Each table corresponds to a different financial asset. The time periods are groups of rows with Minimum and Maximum values. There are two groups of columns, one for Precious Metals and the other for Gold Futures. Each group consists of lpm.1 (downside loss), upm.1 (upside reward) and omega. Each value is associated with a portfolio of financial asset and the commodity (gold futures or precious metals). For example, the minimum and maximum upside reward for large cap stocks in Table 7 and for the time period 1991 to 1995 are 1.2799 and 1.9617 for precious metals and 0.9796 and 1.9617 for gold futures. The minimum values are the worst case outcomes for upside reward and the maximum values are the best case outcomes. Notice that precious metals had the greatest worst case outcome when compared to gold whereas both choices had the same best case outcome. In this case, an investor would prefer precious metals as a diversifying investment combined with large capitalization stocks.

If you look at best and worst case outcomes for downside loss, you would probably not want to consider blending silver with gold. The minimum values for downside loss are associated with the minimum loss portfolio as we discussed in the blog Managing Downside Loss with Gold. On the other hand, if you look at the omega measure, a risk adjusted measure of performance; the blend is clearly the best choice for almost all asset classes and time periods. I think that most investors would rather err on the side of more diversification rather than less when dabbling in commodities.


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Thursday, November 3, 2011

All That Glitters Is Not Gold

By Fred Novomestky, Ph.D

The past several blogs have been devoted to a thoughtful analysis of the inclusion of gold along with financial assets. Using partial moments analysis, it is clear that gold exposure over longer periods of time can be reward enhancing and risk reducing. Gold is but one of several precious metals that commodity trading advisors (CTA’s) incorporate in their managed futures accounts. We take a look at two other precious metals in this blog, namely, silver and platinum.

Gold and silver play a major role in the Dow Jones UBS Commodity Index. The exposures to the various commodities in the index are reset annually. For 2011, the exposure to gold is 10.45% and the exposure to silver is 3.29%. A precious metals sub-index is computed by Dow Jones UBS for gold, silver and platinum. In addition, there is a sub-index for gold and silver. Each of these indices are based on a fully margined commodity futures contract position for the precious metals.

Let us begin by looking at return statistics for the three commodities. Table 1 summarizes the return statistics for gold, silver and platinum. We provide the traditional statistical measures for the monthly total return of these commodities as well as the upper and lower partial moments defined in our recent blog, Partial Moments – the Up and Down of Performance and Risk. We consider four, five-year time periods as we have been doing in the past several blogs, namely, 1991 to 1995, 1996 to 2000, 2001 to 2005, and 2006 to 2010. Silver has had a higher mean return when compared to gold in each of these time periods. It has also experienced more volatility than gold or platinum. Platinum has outperformed gold in three of four time periods. Using a zero return target, platinum has the highest upside probability and lowest downside probability of the three commodities.

In general, precious metal prices tend to move in comparable directions. Table 2 presents the correlations between pairs of commodities for each of the time periods. From a statistical point of view, these numbers are meaningful and substantially positive. These correlations are dynamic and change over time.

While the mean return statistics are interesting, an investor is also interested in seeing the financial rewards from investments in each of the precious metals. Figures 1 through 4 present the cumulative wealth indices for each commodity and each time period. Each curve assumes that the investor allocates 100 domestic currency units (e.g. U.S. dollars) in a commodity. At the end of each month, the entire value determined by that month’s return is reinvested for the next month. Except for 2001 to 2005, the investor would have greater wealth at the end of the five year period by an investment in silver than a similar investment in gold. Platinum is a dominant investment relative to gold except in the 2006 to 2010. With a worst case monthly return of -31.24% in 2008 along with three other significant negative months in 2008 and one in 2010, platinum underperformed both gold and silver.

The commodity trading advisor would combine multiple commodities in a managed futures account to gain the benefits of diversification. Table 3 provides comparable summary return statistics for three portfolios. The first portfolio is the Dow Jones UBS Precious Metals index which combines gold and silver with weights derived from the weights for the individual commodities from the entire index. The second portfolio equally weights gold and silver in each month of a time period. The third portfolio equally weights gold, silver and platinum in each month. Except for the 2006 to 2010 time period, the third portfolio has the highest upside probability and lowest downside probability. Equal weighted portfolios tend to outperform the Dow Jones UBS Index. Figures 5 through 8 show the cumulative wealth indices for the portfolio in each of the time periods and Table 4 summarizes the cumulative results including annualized returns and volatilities. The poor results in 2006 to 2010 for the equal weighted portfolio of three precious metals are due to the adverse performance in 2008 and 2010 for platinum highlighted above. All of these portfolios have volatilities that are normally associated with equity portfolios.

The long term investor can benefit from a strategic exposure to gold and other precious metals in their portfolio. Platinum has potentially attractive benefits. Unfortunately, open interest in the futures market is highest for gold and silver. This limits the potential for using platinum making it one of highest fruits in the market apple tree.


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Friday, October 14, 2011

Managing Downside Loss with Gold

By Fred Novomestky, Ph.D

The current wide swings and volatility in both the financial and commodity markets continue to provide opportunities for and challenges to the investor. Gold prices recently dropped dramatically only to be followed by increases as the equity markets have moved upwards. My previous blogs show how adding gold to financial assets and portfolios of these assets over long time periods can result in significant rewards. Well, it turns out that the inclusion of gold in portfolios can help reduce downside losses as well.

In the blog Partial Moments – the Up and Down of Performance and Risk we showed charts that presented upside reward and downside volatility for each of several asset classes. These charts were compared to the traditional investment opportunity sets. While downside volatility is a more interesting choice for volatility than traditional return volatility, downside loss, the lower partial moment of order 1, is a more compelling measure of the pain or loss to the investor when investment results fall below the target level. A more useful chart is upside reward versus downside loss. We will call this the upside reward downside loss frontier.

Figures 1 and 2 show these frontiers for large capitalization stocks and long term government bonds combined with gold futures, respectively. Notice that each chart has four curves, one for each of four time periods. The time periods are 1991 to 1995, 1996 to 2000, 2001 to 2005 and 2006 to 2010. Each curve shows how upside reward and downside loss varies as you change the allocation between the asset class and gold futures. The data used to construct these curves are found in Tables 1 and 2. There are pairs of columns for each time period. The column labeled lpm.1 is the downside loss measure and the column labeled upm.1 is the upside reward measure. The target level is 0 implying an aversion to negative returns.

Notice that as you follow each curve there is, in most cases, a point on the curve that is the leftmost point. This is the portfolio with the smallest downside loss. For many investors this is becoming an attractive investment strategy. Finding the allocation to gold futures that result in the minimum downside loss portfolio is a challenging portfolio design problem but we will illustrate a way to get a reasonable answer.

Let’s focus on Table 1 and the pair of columns for 1991 to 1995. Notice that the lpm.1 values decrease as you increase the allocation to gold futures until you reach the minimum value. Thereafter the values increase. At the bottom of the column is the minimum value of all the numbers in the column which is 0.3017. All you have to do is locate that value in the column that corresponds to the minimum and highlight it. This value is highlighted and corresponds to a 15% allocation to gold futures. The similarly computed numbers for the other times are highlighted for the other time periods.

Table 3 summarizes the determination of gold allocations that result in minimum downside loss for each of the asset classes we have been using in the recent blogs and for each of time periods. Notice that except for small stocks, no asset class in the 1996 to 2000 time period benefited from a loss minimization through an exposure to gold. I invite you to review the previous blogs that summarize asset class return statistics for this time period. Another important result is that equity asset classes require a higher exposure to gold to achieve the minimum downside loss than the fixed income asset classes.

The blog Portfolio Strategy and Gold discussed the effect of including gold futures as part of the allocation to four different portfolios. The portfolio are (1) all stocks, (2) all bonds, (3) 40% stocks and 60% bonds and (4) 60% stocks and 40% bonds. Figures 3 to 6 present the corresponding upper reward downside loss frontiers for these portfolios combined with gold futures and each time period. The inclusion of gold futures in virtually all portfolios and all time periods has the benefit of reducing the prospects of downside loss. Table 4 summarized the minimum downside loss allocations to gold futures for these portfolios and time periods. Once again, portfolios with higher allocations to equities require more gold exposure to reduce downside loss. The 40% stock 60% bond portfolio is the equal weighted portfolio of all asset classes and hence the perfectly diversified portfolio. This is the portfolio with a 20% allocation to gold futures.

The exposure to gold can provide attractive returns and risk management as well. The challenge for investors is to decide whether they have the appetite for permanent large commitments to gold in their portfolios. We have already looked at the use of a variety of commodities in portfolios to protect purchasing power. We return to this asset classes to view the tradeoff of upside reward and downside loss in the next blog.


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Wednesday, September 21, 2011

Portfolio Strategy and Gold

By Fred Novomestky, Ph.D.

The blog on Asset Allocation and Gold set the stage for encouraging investors to consider the inclusion of gold as a strategic investment. I want to make it clear that there maybe a better alternative to just investing in gold and will get back to this point in the future.

We want to expand on the notion of allocation to gold futures by considering the effect of including gold futures in four illustrative portfolios. The component asset classes are U.S. large cap stocks, small cap stocks, long term government bonds, intermediate term government bonds and long term corporate bonds. We combine the two equity asset classes into a single stock sub-portfolio with perfect diversification as we described in the blog Asset Allocation, Diversification Now Passé?. We defined perfect diversification as an equally weighted portfolio in contrast to perfect concentration in which almost all the invested capital is allocation to one asset. The three bond asset classes are also combined into an equally weighted, perfectly diversified sub-portfolio.

The first of the portfolios consists of a 100% allocation to the stock sub-portfolio and we call it all stock. The second portfolio is called the all bond portfolio and consists of a 100% allocation to the bond sub-portfolio. The third portfolio consists of a 60% allocation to the stock sub-portfolio and a 40% allocation to the bond sub-portfolio. The fourth portfolio has a 40% allocation to the stock sub-portfolio and a 60% allocation to the bond sub-portfolio. A simple arithmetic calculation will reveal that there is a 20% allocation to each of the five asset classes that make up the portfolio and therefore this portfolio has perfect diversification.

To maintain consistency with our previous analysis, we use monthly returns for the asset classes to compute the monthly returns of the four portfolios. Each portfolio is assumed to re-balance at the beginning of each month to the same weights that characterize the portfolio. The entire time period January 1991 to December 2010 is divided into four time periods: 1991 to 1995, 1996 to 2000, 2001 to 2005 and 2006 to 2010. The summary return statistics for each portfolio and gold futures are found in Tables 1 to 4. Except for the 2006 to 2010 time period, the 40% stock 60% bond portfolio has the highest omega measure showing the value of perfect diversification.

We use the same proxy for gold futures investment as in the previous blog, namely, the Dow Jones UBS gold futures total return index. Table 5 shows the correlation of gold futures to each of the portfolios. In 1991 to 1995, all the correlations were negative in the subsequent time periods, there were positive but not necessarily significant.

Figures 1 to 4 highlight the omega measure over a range of allocations to gold from 0% (the traditional asset class investor) to 100% (the gold commodity trading advisor) for each of the four time periods. All portfolios in all time periods benefit from the incorporation of gold futures. An allocation to gold futures between 10% and 40% shows the 40% stock 60% bond having the best lower partial moment risk adjusted performance.

What is interesting to note is that as is the case with asset classes the investor benefits from the inclusion of gold in their portfolio. In the next blog we continue with our analysis of gold investing in pursuit of the portfolio with minimum downside loss.


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Friday, September 9, 2011

Asset Allocation and Gold

By Fred Novomestky, Ph.D.


In my previous blog, The Prudent Investor and Gold, I looked at the long term behavior of traditional asset class returns and the gold spot returns. We established that the flat-currency price of gold will by flat or decline when real returns on assets are high. Conversely, when real returns have been low or stagnant, then gold has been strong.

We also found a surprise in that these correlations are not really meaningful. In fact, for all intent and purposes, gold spot returns are uncorrelated with the returns of U.S. stocks and bonds. This is still good news for the investor.

At a time when investors are seeing dizzying movements in gold prices, the prudent investor would like to know the answer to three questions. First, should I have a strategic exposure to gold in my portfolio? Second, what are reasonable allocations to gold? Finally, how can invest in gold? In this blog, we will try to answer the first two questions using partial moment analysis that was introduced in the blog, Partial Moments – the Up and Down of Performance and Risk . Let’s tackle the third question first.

Currently, there are three ways to create an exposure to gold price movements in a portfolio. A traditional approach is to invest in a mutual fund of equity shares for those companies that have earnings linked to gold price movements. These may be companies that mine gold or companies that created products made of gold. Academics and practitioners have found this a poor proxy for gold price movements because their earnings may be affected by economic factors other than gold. A second approach is to invest in gold futures contracts that are fully margined by cash in a risk free portfolio. This means, for example, a $10,000,000 exposure to the most liquid gold futures contracts is collateralized with a $10,000,000 margin account. The investor has to manage variation margin and the roll of futures contract before the likelihood of taking delivery of actual gold. Finally, the investor can use an exchanged traded fund like the iShares Gold Fund.

We will use the second approach and represent the performance of such a trading strategy with the daily returns of the Dow Jones UBS Commodity Index component for gold futures. The daily return series carefully takes into account the full margining and control roll. The data used for the analytical portion of this blog can be found on http://www.djindexes.com.

We derive monthly returns of gold futures that are then compared to the monthly returns of traditional U.S. capital market investments in U.S. large and small cap stocks, long and intermediate term government bonds and long term corporate bonds. In contrast to the previous blog, we look at four time periods each of five calendar years in duration. The time periods are 1991 to 1995, 1996 to 2000, 2001 to 2005 and 2006 to 2010. Tables 1 to 4 provide the summary statistics for these asset class, spot gold and gold futures for each of these time periods. The differences you see between gold spot and gold futures are due to the characteristics of futures pricing and contract rolls relative to the simple London pricing fixing of spot gold prices. Furthermore, from Table 5, the correlation between gold spot and futures returns are virtually one indicating that the futures trading in gold is an excellent proxy for spot trading.

The next question is how much to allocation to gold for each of the traditional capital market investments described above. We use the omega measure that defined in the blog, The Prudent Investor and Gold. For a given target level, it is the upside reward divided by the downside loss and provides a target return basis of defining risk adjusted returns very much like Sharpe ratios. We now consider simple portfolios that combine each of the five traditional asset classes with an exposure to gold futures. For each time horizon and gold futures allocation, we compute the returns of a portfolio that is rebalanced monthly to begin each month with the same gold allocation. The omega measure is then computed for each portfolio.

Figures 1 to 5 highlight the omega measure over a range of allocations to gold from 0% (the traditional asset class investor) to 100% (the gold commodity trading advisor) for each of the asset classes and for each of the four time periods. The optimal allocation to gold futures is that exposure that produces the highest omega measure. For U.S. stocks there is such a value except for the 1996 to 2000 time period in which gold is not a good diversifying investment. For fixed income investments, the benefit of gold allocation is noticeable since 2001.

What is interesting to note is that generally speaking across all asset classes and time periods the investor benefits from the inclusion of gold in their portfolio from as little as 10% (very conservative) to 40% (very aggressive). In the next blog we continue with our analysis of gold investing.

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