Watch Art Cashin: Why lower oil isn't good news

Art Cashin says lower oil prices and falling interest rates could be a sign of a slowing economy and a threat to the stock market's ongoing rally.

Cashin, UBS' director of floor operations at the NYSE, told CNBC's Bob Pisani around midday this is going to be a "very critical week to watch and the earnings come out and the guidance comes out."

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