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An AT&T store is seen on 5th Avenue in New York on October 23, 2016. 
AT&T unveiled a mega-deal for Time Warner that would transform the telecom giant into a media-entertainment powerhouse positioned for a sector facing major technology changes. The stock-and-cash deal is valued at $108.7 billion including debt, and gives a value of $84.5 billion to Time Warner -- a major name in the sector that includes the Warner Bros. studios in Hollywood and an array of TV assets such as HBO and CNN. / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)
An AT&T store is seen on 5th Avenue in New York on October 23, 2016. 
AT&T unveiled a mega-deal for Time Warner that would transform the telecom giant into a media-entertainment powerhouse positioned for a sector facing major technology changes. The stock-and-cash deal is valued at $108.7 billion including debt, and gives a value of $84.5 billion to Time Warner -- a major name in the sector that includes the Warner Bros. studios in Hollywood and an array of TV assets such as HBO and CNN. / AFP / KENA BETANCUR        (Photo credit should read KENA BETANCUR/AFP/Getty Images)

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Christine Romans has the day's top business headlines before the opening bell on Wall Street on Tuesday, March 20.

CNNMoney Before the Bell

Christine Romans has the day's top business headlines before the opening bell on Wall Street on Tuesday, March 20.