The benchmark Standard & Poor’s 500 was up 4.3% today after central banks in the U.S., Europe, and Japan said that they’d help supply cash to avoid a credit crunch if the European debt crisis worsens. That buoyed media stocks: The Dow Jones U.S. Media Index was up nearly 4.4%. CBS shares rose 5.8%, giving it the biggest bump among the elite group of Big Media companies. It was followed by Disney (+5.4%), News Corp (+5.4%), Time Warner (+4.3%), Viacom (+4.3%), Comcast (+4.2%), and Sony (+2.7%). Among other media companies, Westwood One and The New York Times were up more than 10%. Companies up more than 9% include Outdoor Channel, LIN TV, and Entercom. Only a few companies lost ground. The hardest hit was Netflix, down 4.5% after Wedbush Securities’ Michael Pachter downgraded the video rental firm to “underperform” from “neutral.” His rationale: “We think that the company’s pricing structure is wrong, and its business model is broken. At current prices, we expect Netflix to continue to lose more hybrid (DVD and streaming) customers than it adds, and those who remain will not be particularly profitable.”

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