From Time (a part of Time Warner, formerly AOL Time Warner): "Blockbuster mergers tend to be duds for stockholders of the acquiring company [TP comment: Duh!]. In seven of the nine mergers valued at more than $50 billion, the acquirer's share price is down an average of 46% from pre-merger levels [TP comment: That's a lot!], according to FactSet Mergerstat, a research firm from Santa Monica." (As Time candidly points out, TW and AOL were the worst, wiping out 80% of shareholder value.)
BUT THIS TIME IT WILL BE DIFFERENT!