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The high levels of public and private debt would only be really worrisome if interest rates were not so low, Harvard economist Ken Rogoff told CNBC on Friday. Reacting to concerns from
closely followed contrarian Marc Faber about a possible new financial crisis brewing, Rogoff said in a "Squawk Box" interview, "I don't think the lights are all blinking
red yet." Faber told CNBC on Thursday that he worried about a crisis developing in the second half of this year that could dwarf the downturn of 2008, because the debt-to-GDP ratios in
advanced economies are higher than in 2007. Read MoreI'm worried about a crisis bigger than 2008: Marc Faber Downplaying the likelihood of that scenario, Rogoff acknowledged that
overall debt levels are "very high." But as long as interest rates "stay benign," he doesn't see debt as a big problem. In fact, he argued: "Credit has been
flowing again and that's a good thing. It's part of the normalization." _ —By CNBC's Matthew J. Belvedere._