Global Markets Bounce Back, Post First Monthly Gain in 4 Months

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Global Markets Bounce Back, Post First Monthly Gain in 4 Months

The long-run performance

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for the Global Market Index (GMI) ticked higher in October. Monday’s revised forecast marks the first higher estimate in the past four months for GMI, an unmanaged benchmark that holds all the  (except cash), based on market weights via a set of ETF proxies.

GMI’s long-term projection is currently an 6.9% annualized total return, up from 6.7% in the via the average of three models (defined below).

US equities remain a downside outlier for changes in expected return compared to history and the various asset classes that comprise GMI. The average forecast for ********* share continues to print well below its trailing 10-year performance. As a result, US shares are expected to earn noticeably softer results in the years ahead vs. the market’s realized return over the past decade. On the other hand, the rest of the major asset classes continue to post return forecasts that are higher relative to their trailing 10-year records. Based on these estimates, the case for a globally diversified portfolio looks more attractive compared to the past decade.

GMI represents a theoretical benchmark for the “optimal” portfolio that’s suited for the average investor with an infinite time horizon. On that basis, GMI is useful as a starting point for customizing asset allocation and portfolio design to match an investor’s expectations, objectives, risk tolerance, etc. GMI’s history suggests that this passive benchmark’s performance is competitive with most active asset-allocation strategies, especially after adjusting for risk, trading costs and taxes.

It’s likely that some, most or possibly all of the forecasts above will be wide of the mark in some degree. GMI’s projections, however, are expected to be somewhat more reliable vs. the estimates for its components. Predictions for the specific markets (US stocks, commodities, etc.) are subject to greater volatility and tracking error compared with aggregating the forecasts into the GMI estimate, a process that may reduce some of the errors through time.

Another way to view the projections above is to use the estimates as a baseline for refining expectations. For instance, the point forecasts above can be adjusted with additional modeling that accounts for other factors not used here — current valuation, such as dividend yield.

For perspective on how GMI’s realized total return has evolved through time, consider the benchmark’s track record on a rolling 10-year annualized basis.

The chart below compares GMI’s performance vs. the equivalent for US stocks and US bonds through last month. GMI’s current return for the past ten years is 7.3%, which is middling relative to recent history.

Here’s a brief summary of how the forecasts are generated and definitions of the other metrics in the table above:

BB: The Building Block model uses historical returns as a proxy for estimating the future. The sample ******* used starts in January 1998 (the earliest available date for all the asset classes listed above). The procedure is to calculate the risk premium for each asset class, compute the annualized return and then add an expected risk-free rate to generate a total return forecast. For the expected risk-free rate, we’re using the latest yield on the 10-year Treasury Inflation Protected Security (TIPS). This yield is considered a market estimate of a risk-free, real (inflation-adjusted) return for a “safe” asset — this “risk-free” rate is also used for all the models outlined below. Note that the BB model used here is (loosely) based on a methodology originally outlined by Ibbotson Associates (a division of Morningstar).

EQ: The Equilibrium model reverse engineers expected return by way of risk. Rather than trying to predict return directly, this model relies on the somewhat more reliable framework of using risk metrics to estimate future performance. The process is relatively robust in the sense that forecasting risk is slightly easier than projecting return. The three inputs:

* An estimate of the overall portfolio’s expected market price of risk, defined as the Sharpe ratio, which is the ratio of risk premia to volatility (standard deviation). Note: the “portfolio” here and throughout is defined as GMI

* The expected volatility (standard deviation) of each asset (GMI’s market components)

* The expected correlation for each asset relative to the portfolio (GMI)

This model for estimating equilibrium returns was initially outlined in a 1974 paper by Professor Bill Sharpe. For a summary, see Gary Brinson’s explanation in Chapter 3 of The Portable MBA in Investment. I also review the model in my book Dynamic Asset Allocation. Note that this methodology initially estimates a risk premium and then adds an expected risk-free rate to arrive at total return forecasts. The expected risk-free rate is outlined in BB above.

ADJ: This methodology is identical to the Equilibrium model (EQ) outlined above with one exception: the forecasts are adjusted based on short-term momentum and longer-term mean reversion factors. Momentum is defined as the current price relative to the trailing 12-month moving average. The mean reversion factor is estimated as the current price relative to the trailing 60-month (5-year) moving average. The equilibrium forecasts are adjusted based on current prices relative to the 12-month and 60-month moving averages. If current prices are above (below) the moving averages, the unadjusted risk premia estimates are decreased (increased). The formula for adjustment is simply taking the inverse of the average of the current price to the two moving averages. For example: if an asset class’s current price is 10% above its 12-month moving average and 20% over its 60-month moving average, the unadjusted forecast is reduced by 15% (the average of 10% and 20%). The logic here is that when prices are relatively high vs. recent history, the equilibrium forecasts are reduced. On the flip side, when prices are relatively low vs. recent history, the equilibrium forecasts are increased.

Avg: This column is a simple average of the three forecasts for each row (asset class)

10yr Ret: For perspective on actual returns, this column shows the trailing 10-year annualized total return for the asset classes through the current target month.

Spread: Average-model forecast less trailing 10-year return.

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