Affordable Care Act navigator Nini Hadwen (R) works with Marta Aguirre as she shops for health insurance during a navigation session put on by the Epilepsy Foundation Florida to help people sign up for health insurance under the Affordable Care Act on October 8, 2013 in Miami, Florida.
Affordable Care Act navigator Nini Hadwen (R) works with Marta Aguirre as she shops for health insurance during a navigation session put on by the Epilepsy Foundation Florida to help people sign up for health insurance under the Affordable Care Act on October 8, 2013 in Miami, Florida. - 
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It's an odd day for financial markets, with the bond market closed for Columbus Day. But the stock market is open and with no clear path toward re-opening closed parts of the federal government or averting an impact with the federal debt ceiling, the mood is subdued on stock markets.

The Nobel Committee has awarded the Nobel Prize in Economics to three Americans: Eugene Fama, Lars Peter Hansen, and Robert Shiller. The trio has focused on the behavior of the stock market as well as the efficiency of markets.

Open enrollment in Medicare begins tomorrow -- that's when any Medicare recipient can change their health or drug coverage plans with no penalties. But add the newly-unveiled health insurance exchanges to the mix and suddenly seniors are confused about where to sign up for what and when.

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Follow David Brancaccio at @DavidBrancaccio