"The index topped a few months ago, and on each rebound we're seeing lower highs followed by lower lows, " says Stack, who cautions that it's not unreasonable to assume that home owners will see 30% to 50% of the last five years' price gains erode as interest rates and high home prices put an end to the boom.

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The lower density means dramatically less drag force acting on the spinning disk stack so that mechanical power into the motor is substantially reduced.

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Nonetheless, persistent economic weakness and declining consumer confidence, says Stack, suggest that the claw of the bear may send stocks lower still.

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