In the series of posts (Part 1, Part2) examining the financial myths mentioned in David Trahair’s book Smoke and Mirrors, let’s take a look at the third myth:

Don’t worry about your investments; you’ll be fine in the long run

Mr. Trahair is sceptical of stocks for the long run and says that over the twenty years from Sept. 1986 to Sept. 2006, the TSX averaged 7.1% and 8.2% for the ten year period from 1996. Meanwhile, the average prime rate for the last ten years has been 5.4%.

I find this to the lamest of Mr. Trahair’s myths because for a chartered accountant, he makes an elementary mistake. He ignores the fact that you earn dividends from equities and return calculations should be made assuming these dividends are reinvested. While he rightly points out mutual fund fees reduce investment returns, he doesn’t explore ETFs and index mutual funds in any depth.

Using the Stingy Investor website’s return calculator, we find that the TSX returned 10% over the 20-year period and 9.97% over the 10-year period ending in 2006, significantly better than the figures used in the book. A simple diversified portfolio of 20% bonds, 30% Canadian and 50% US equities would have 20-year returns of 10.45% and 10-year returns of 8.25%. Not bad for a portfolio that takes fifteen minutes to construct and five minutes every year to maintain!