When all the investment numbers start to blur, evaluate why...

When all the investment numbers start to blur, evaluate why you want to invest. (Feb. 17, 2012) Credit: AP

Next month something very dramatic is going to happen to most stock mutual funds. In fact, it's already started to happen.

The dramatic event is this: Those funds will hit the three-year anniversary of the nadir of the market in March 2009. And that means their three-year-return numbers will start to look amazingly good.

Think I'm being hyperbolic? The most widely held mutual fund -- the Vanguard Total Stock Market Index Fund -- is up at an annual rate of 30.23 percent from March 6, 2009, (the trough, by some measurements) through the end of last month, Jan. 31.

Dial those numbers back by six months -- from before the 2008 decline to before the big 2012 gains -- and the average annual returns for the same fund are 0.91 percent for the three-year period between Aug. 29, 2008 and Aug. 30, 2011.

"I'd be cautious about taking these new three-year annualized returns and saying: 'Wow, this fund is great!' " says Tom Roseen, an analyst with mutual fund research firm Lipper, a Thomson Reuters company. Another example: The widely held Vanguard Index Trust 500 Index Fund is up 28.66 percent from the trough through the end of last month, but up only 0.3 percent for the three-year period ending Aug. 30, 2011.

Past performance really doesn't guarantee future results. Mutual fund investors are used to seeing those words, but it's hard to imagine a better illustration of how true they are.

People who stolidly kept putting money into the market (say, through weekly retirement plan contributions) despite the declines, and then rebalanced regularly, probably did even better than these averages, he said.

NewsdayTV's Doug Geed shows us some great spots 'Out East' to visit this summer. Credit: Brian Jingeleski, Randee Daddona

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