I’ve brought this up a number of times, but I figured a few facts, or factoids, at least, to refute the “7% real return” that got brought up above by Sam Stone is in order:
Using the figures (free because they’re offered as a promo, and therefore not really verifiable. However, they do agree with the Ibbotson data since 1925 to a large degree, as far as I can tell.) available at Global Financial Data, for the S&P 500’s total return since 1871 and for inflation since that time as well, the real return available, which assumes zero transaction costs, zero taxes, zero management fees, and reinvestment of all dividends, although at what rate (monthly, yearly, etc.) I don’t know, in other words, about as best case a scenario as you can possibly get, the 40-year returns are as follows:
Mean: 6.51%
Median: 6.04%
Minimum: 2.44%
Maximum: 9.70%
In addition, the distribution clusters around a result of between 3.525% and 5.34%, with 26 years out of 92 possible years coming in in that range, which largely explains why the median, which defines the figure where half the years were higher and half were lower, is lower than the mean, which is the average as normally defined, where you take the sum of all of the results and divide by the number of samples, or 92. Even more indicative of what a more normal expected result would be, 58 out of 92 years, or 63% of the samples, were “below average”, that is, came in with a return less than that average return of 6.51%. Or, you have a 6 out of 10 chance of making less than a 6.51% real return, even if everything is perfect.
Which is a long way of saying that it ain’t going to be 7%. If you take the maximum risk, that is putting all of your investment into the market, and you get a “normal” result after all the costs are factored in, you’ll probably get 5%.
Please note that that’s a real rate of return, so if you, for instance, put 3% in as an inflation rate, the return you’d see would be 8%. Please note also that you’d have to be nuts to take the maximum risk.
Finally, little known fact: there was a large inflation - prices almost doubled - and a stall in the appreciation of the stock market during and after World War One, which resulted in two twenty year periods, those ending in 1920 and 1921, in which real returns were negative. Now the figures from this time period aren’t as reliable as those used by Ibbotson beginning in 1925, but that should still give pause to those who think that the market over any twenty year period will show a positive real return. This twenty year figure is important, since most people will make most of their lifetime earnings in the second twenty-year half of their career, so the average duration of their investment, when weighted by the amount they actually put in each year, will be significantly less than 40 years, at least at the start of their retirement.
I realize this is a bit of a hijack from the subject of this thread, but I needed to throw a little cold water on that 7% figure. Please note that in addition to transaction and management fees, there will be the “elucidator effect” (see penultimate paragraph of previous post) as well. Don’t know how much that effect will be, but I have a suspicion it will be statistically significant.