Ten Stock-Market Myths That Just Won't Die

These kinds of stomach-churning swings are testing investors' nerves once again. You may already feel shattered from the events of 2008-2009. Since the Greek debt crisis in the spring, turmoil has been back in the markets.

At times like this, your broker or financial adviser may offer words of wisdom or advice. There are standard calming phrases you will hear over and over again. But how true are they? Here are 10 that need extra scrutiny.

1 "This is a good time to invest in the stock market."

Really? Ask your broker when he warned clients that it was a bad time to invest. October 2007? February 2000? A broken watch tells the right time twice a day, but that's no reason to wear one. Or as someone once said, asking a broker if this is a good time to invest in the stock market is like asking a barber if you need a haircut. "Certainly, sir -- step this way!"

2 "Stocks on average make you about 10% a year."

Stop right there. This is based on some past history -- stretching back to the 1800s -- and it's full of holes.

About three of those percentage points were only from inflation. The other 7% may not be reliable either. The data from the 19th century are suspect; the global picture from the 20th century is complex. Experts suggest 5% may be more typical. And stocks only produce average returns if you buy them at average valuations. If you buy them when they're expensive, you do a lot worse.

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