Stock Market Predictions Are Worthless

Stock Market Predictions Are Worthless

I am not sure what our fascination with predictions is all about.  Whether it is political elections, sports, or the financial markets, everyone seems to be willing to stop and listen to someone willing to make a prediction.  Rarely do we ever go back to evaluate how those predictions pan out?  Regarding investment predictions, every once and awhile, I like to go back and check the accuracy of those prognosticators against the investment markets to see how they have held up.  One of the most famous is Jeremy Grantham, founder of GMO, a multi-billion dollar asset management company.  He periodically published a 7-year market prediction and gained quite a bit of notoriety for accurately predicting much of the investment returns in the early part of the 1990s.  As we approach the end of his 7-year forecast from June 30, 2008, I thought it would be helpful to evaluate his predictions (caveat- the index returns go through 5/31 while the GMO forecast is through 6/30):

Asset Class Index GMO Forecast Actual Return
US Large Cap Stocks S&P 500 3.2% 9.85%
US Small-Cap Stocks Russell 2000 2.1% 10.46%
Int’l Large-Cap Stocks MSCI EAFE 5.8% 2.42%
Int’l Small-Cap Stocks MSCI EAFE Small 6.2% 5.69%
US REITs DJ Select REIT 2.7% 8.4%
Emerging Mkt Stocks MSCI Emerging Mkts 6.8% 1.25%


So, if you had taken GMO’s advice and overweighted the areas they predicted would perform the best, you would have put most of your money in emerging market stocks and international stocks.  The asset classes that predicted the worst performance (US stocks and REITs) had been the best places to invest.  The point is, no one has a crystal ball.  Those that have been right in the past have no better chance of being right in the future.  Once you realize this, you’ll be a much better investor, immune from the siren song of predictions.

Information contained herein has been obtained from sources considered reliable, but its accuracy and completeness are not guaranteed. It is not intended as the primary basis for financial planning or investment decisions and should not be construed as advice meeting the particular investment needs of any investor. This material has been prepared for information purposes only and is not a solicitation or an offer to buy any security or instrument or to participate in any trading strategy. Past performance is no guarantee of future results.

Recent Insights

Those That Don’t Know Their History Are Doomed to Repeat It: Beware of the S&P 500 Index

For the last 10 years the S&P 500 has generated an average annual return of 15.35% and has only had one negative year (2018). In addition, these mutual funds have expense ratios hovering around zero. What’s not to love?

A Year to the Day- What a Ride!

The market last year tested our patience and our resolve. Those who buckled up and stayed on board, however, were richly rewarded.

IRS Extends 2020 Tax Filing Deadline to May 17th

On March 17th, the IRS announced they would be extending the 2020 tax filing deadline for individuals from April 15th to May 17th to accommodate the ongoing challenges presented by the COVID-19 pandemic.