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Mega Merger Monday; AT&T to buy DirecTV; AstraZeneca rejects improved offer from Pfizer; Hiring for MBAs is picking up

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It's a mega merger Monday, AT&T (T) is making a play for DirecTV (DTV). AT&T is buying America's biggest satellite TV provider $48.5 billion in stock and cash. The combination would beef up AT&T's cellular, broadband, TV and fixed-line phone services. The deal comes as Comcast (CMCSA) awaits regulatory approval of its $45 billion bid for Time Warner Cable (TWC).

Meantime, AstraZeneca (AZN) continues to play hard-to-get with Pfizer (PFE). The British drug maker rejected Pfizer's improved and "final” takeover bid. AstraZeneca says the new offer "undervalues the company and its attractive prospects.”

One of the stocks the Yahoo Finance team will be watching today is Campbell Soup (CPB). Shares of the company fell in early trading after it lowered its sales outlook for the year. The company now says its expects sales to grow about 3%, down from its prior estimate of 4% to 5%. Adjusted earnings came in at $0.62 a share, which beat estimates by $0.03. Revenue of $1.97 billion also missed the mark by $30 million.

Hiring for MBA graduates is picking up. A new survey by the Graduate Management Admission Council, which administers the GMAT exam found 86% of U.S. companies plan to hire MBA graduates in 2014, up from 81% 2013 and 51% in 2009 during the financial crisis. In poll today, we want to know: Is an MBA worth the money? Cast your vote, or leave a comment below or on Twitter.