American bonds and stocks tumbled yesterday, following Friday's employment report that was stronger than expected for a second consecutive month.

Those transactions went awry when those bonds tumbled in value.

Marvel shares fell 40 percent; its bonds tumbled.

And if economic storm clouds loomed, such bonds - which some investors have stocked up on in recent years - could really tumble.

But both the bond and stock markets have tumbled each of the three times the Fed has raised interest rates since February.

If interest rates rise, the bonds are less attractive and may tumble in value to, say, $9.5 million.

With a rate increase next week, the outlook would be different, even if stocks and bonds tumble initially.

Marriott's 20-year bonds tumbled 30 percent after the plan was announced.

The bonds tumbled in value when interest rates unexpectedly soared last month.

The 30-year bond tumbled 1 8/32, to a price of 94 12/32, pushing its yield up to 7.08 percent, from 6.98 percent on Wednesday.