Monday, April 25, 2011
Caution: Your Brain Really Loves Anticipating Financial Gain
Friday, April 15, 2011
Our Brains and Investing History

While reading this book, I have been re-posting some chapter summaries from Jason Zweig's, Your Money & Your Brain, and I cant help but see the connection between how our brains drive us and the booms and busts we see in the investment cycle.
What we know is that making money creates a euphoria in our brain that is similar to a cocaine high. But when we start to lose, our lizard (reactive) brain takes over and we panic and flee. Neither state is rational.
What we have observed in the 300 years, or so, of market history is that financial markets tend to swing wildly. This is not new to the last few years. There is a rich history of boom and bust cycles. Investors drive up the price of everything; from tulips in Holland in the 1600's to on-line pet stores in the 1990's, all in an irrational frenzy of greed, then see it destroyed when some event trips their collective lizard brain into a protective panic state. As I read I will occasionally leave some quotes from the book that reflect how investment history repeats itself. It was already reapeating itself in the early 1800's. This from Lord Overtone in 1825:
"First we find it in a state of quiet, -next improvement,-growing confidence,-pressure,-prosperity,-excitement,-overtrading,-convulsions,-pressure,-stagnation,-distress,ending again in quiet."
Monday, April 11, 2011
BEWARE: Your Lizard Brain Can Dominate Your Investing Decisions.
Thursday, April 7, 2011
An understanding of your brain functioning could improve your investment performance.
Sunday, March 13, 2011
Think you can invest without help? Think again.
Sunday, March 6, 2011
AWM analysis of weighting of US/International Stocks
I recently had my University of Buffalo graduate student of financial engineering, Shwetha Narayan Iyengar complete an analysis on the diversification effect of adding international stock to a stock portfolio.
The study summarized below is not a recommendation , rather it shows how adding international stocks can reduce overall risk and improve return.
There is debate on how much non-us stock should be in stock portfolio. The results do seem to support those that argue that investors should hold stocks in proportion to their weighting in the mix of all stocks issued by all nations. The US currently makes up about 45% of the global capital market.
Keep in mind that this analysis does not include emerging markets or factor in value or small cap effects. It does support a diversification into international stocks when building your stock portfolio.
The summary:
Analysis of total US market vis-à-vis the other developed markets in a portfolio.
The CRSP 1-10 Index represents the total US cap weighted equity market. It measures the performance of all stocks aggregated across NYSE, AMEX and NASDAQ markets, spilt in deciles from large cap to small cap. MSCI EAFE index measures the equity market performance of developed markets outside of the U.S. & Canada and includes Europe, Australia, New Zealand (Australasia) and Middle East
Annualized returns and Standard deviation (measure of risk/volatility) for CRSP and EAFE for a period from 1970- 2010 are as provided below,
Annualized | Returns | STD deviation |
CRSP1-10 | 9.88% | 16.13% |
EAFE | 9.94% | 17.25% |
Portfolio with 45/55 ratio of CRSP 1-10/EAFE gives the highest return for risk ratio (Sharpe ratio) and to further validate, a Monte -Carlo simulation value averaged over 3 independent simulations provides a higher value at 90 percentile or 10% probability of going above the value. (Monte Carlo is a statistical tool that will estimate probable outcomes for a particular set of risk and return inputs)
Weights | ||||||||||
CRSP1-10 | 55% | 60% | 65% | 70% | 75% | 80% | 85% | |||
EAFE | 45% | 40% | 35% | 30% | 25% | 20% | 15% | |||
Return Portfolio | 10.196% | 10.185% | 10.168% | 10.145% | 10.116% | 10.081% | 10.040% | |||
Std deviation Portfolio | 14.910% | 14.899% | 14.926% | 14.989% | 15.089% | 15.226% | 15.400% | |||
Sharpe ratio | 0.311938 | 0.311430 | 0.309728 | 0.306892 | 0.302936 | 0.297911 | 0.291883 | |||
| | | | | | | | |||
Wealth at retirement (90-percentile) from Monte Carlo simulation | ||||||||||
Scenario 1 | $4,893,889 | $4,590,990 | $4,450,640 | $4,763,008 | $4,428,423 | $4,755,993 | $4,338,645 | |||
Scenario 2 | $4,593,936 | $4,237,107 | $4,514,705 | $4,570,777 | $ 4,709,112 | $4,748,913 | $ 4,483,666 | |||
Scenario 3 | $4,610,162 | $4,517,348 | $ 4,627,469 | $4,369,035 | $ 4,385,526 | $ 4308,407 | $ 4,631,853 | |||
Average, Wealth at retirement (90-percentile) MonteCarlo simulation | $4,699,329 | $4,448,482 | $4,530,938 | $ 4,567,607 | $ 4,507,687 | $4,604,438 | $ 4,484,721 | |||
The most optimum scenario is 55/45 portfolio. A higher weighting of CRSP 1-10 reduces the Sharpe ratio, the return and the final value of the portfolio. If the analysis is expanded using higher weights for the MSCI EAFE and lower weight for CRSP 1-10 , the result does not vary much and the most optimum portfolio still remains as 55/45 .