"When it dries up, it is likely that the market fundamentals will still be questionable."

Knowledge and experience in the markets- Day traders must have an understanding of market fundamentals if they're going to succeed.

He recalled when the yield on the long bond was as low as 5.78 percent in October 1993, "and that was also beyond market fundamentals."

"I think too much is made of the currency fluctuation and too little of the market fundamentals," he said.

While the technical activity had increased, he said, there has been no apparent change in market fundamentals.

The demand this time is based more closely on market fundamentals.

But sometimes, as happened yesterday with the computer selling, factors that have little to do with market fundamentals or the world economy also play a large role.

Their activity is helping to move crude prices faster and farther than market fundamentals would seem to warrant, and not always in the expected direction.

Securitization also made subprime mortgages seem not to be very risky, until the market fundamentals changed and home prices stopped soaring.

Underlying market fundamentals - especially wholesale prices - should determine the price consumers pay.