"Thus stocks tend to do best when investors expect economic acceleration, for example a year ago," he said.

But in the short term stocks tend to be more volatile.

When analysts step up their earnings projections, those stocks or stock groups tend to do better than the overall market.

A. Schwab's stock tends to go through a bad period once every couple of years.

Traders gave two reasons why oil and stocks were tending to move in the same direction.

The funds and stocks tend to pay dividends, though usually meager.

But longer term, both stocks and bonds tend to do better.

But the stocks of the two groups tend to move in lock step.

When interest rates fall, these stocks tend to do well.

The researchers found that the stocks of companies whose headquarters are in the same geographical area tend to rise and fall together.