Two weeks ago, I offered some alternative views on volatility. One of them was from Nassim Taleb, a guest on my radio show and author of the recent best-seller, The Black Swan. A wonderful example from his previous book, Fooled by Randomness, illustrates the cost of focusing on short term results.
Imagine you are retired and spend all your time tending to your nest egg. Let's assume two things about your portfolio performance:
- You will earn 15% ; and
- The variance will be ± 10% from this average.
Based on the information above, we know the long-term result of your portfolio will be around 15%; but in any given year, the 10% variance means the return could vary significantly from that number.
The question is: How much will the short-term results differ from the long-term certainty?
Suppose we use a Monte Carlo simulation to generate 100 possible futures. We would expect the results, when plotted, to resemble a standard bell curve. In other words, 68 of the 100 different possible results would lie within one standard deviation of 15%, or somewhere between 5% and 25%.
Moreover, all but 5 sample years would be within two standard deviations, falling somewhere between -5% and 35%. So even though the long-term return is 15%, the variance from year to year can be hefty.
Given the normal distribution within our bell curve, we know that the probability of your portfolio being positive, in any given year, is 93%. Those are pretty good odds, wouldn't you say?
Now here is where people lose the game. If you focus on the short-term results, randomness has some "unexpected scaling properties" (see the table below). At any given second, your portfolio has basically a 50/50 chance of being positive! If you check it every day, you will be distressed just slightly less than half the time. If you read only your monthly statements, however, you'll be pleasantly surprised two-thirds of the time. And if you calculate your net worth only once a year, you will be tickled pink 19 years out of every 20!
Now consider this. Psychologists tell us the pain of loss is felt far more than the pleasure of equivalent gains. Given that, imagine the effect your constant monitoring of short term performance will have. You can see how shorter term monitoring causes emotional responses.
Of course, if the volatility were higher than 10%, the swings would be even greater. Needless to say, your discomfort is likely to be magnified accordingly, right?
What we have here is confusion. When looking at your portfolio, you are confusing signal with noise, something I have written about previously. We can calculate the noise-to-signal ratio of your hypothetical portfolio I described above.
According to the chart in Nassim's book, if you check your investments every year, then for every true reading you will encounter 0.7 misleading ones. If you check performance once a month, the noise-to-ratio is 2.32 to 1. And if you are checking streaming real-time quotes by the second, the noise-to-signal is a completely ridiculous 1,796 to 1!
Investors must choose their investments based on how well they match up to their lifetime objectives, risk tolerance, time horizon and temperament. Once determined, the investments should not change unless one of these factors change and that shouldn't be very often. To look at a portfolio at any point in time and make a change based on your perception of performance in that moment is death by a thousand cuts.
SOURCE:
1. Fooled by Randomness: The Hidden Role of Chance in the Markets and in Life by Nassim Nicholas Taleb; second edition (Texere, 2004)
http://www.amazon.com/exec/obidos/ASIN/158799190X/financialsu0f-20
Kim Snider, Kim Snider Financial Communications, Chronim Investments and/or Snider Advisors make no representation that the information and opinions expressed are accurate, complete or current. The opinions expressed should not be construed as financial, legal, tax, or other advice and are provided for informational purposes only. Call 866-952-0100 to request the Snider Investment Method™ Owner's Manual, which includes a description of the Snider Investment Method, investment objectives, risks, suitability and other information. Please read and consider carefully before investing. All investments are subject to risk including possible loss of principal.