Traders work on the floor of the New York Stock Exchange (NYSE) on April 24, 2018 in New York City. 
Traders work on the floor of the New York Stock Exchange (NYSE) on April 24, 2018 in New York City.  - 
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Thursday saw another big stock market sell-off.  The Dow Jones Industrial Average slumped 464 points, or 1.9 percent. The Dow is off 10 percent for December, and the Nasdaq is down more than 19 percent since Aug. 29. The bond market has been heading in the opposite direction these last few weeks, as increased investor interest in bonds has been driving prices up and therefore sending yields down. That's how it works, remember: When bond prices rise, yields fall. The yield on the 10-year Treasury finished today almost a half percent lower than its recent October peak. What do the bond markets tell us about how investors are feeling about the economy?

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Follow Tracey Samuelson at @tdsamuelson