The combined value of all M&A deals from 1980 to the end of 2015 was almost 65 trillion -- bigger than the current annual world economy value outside the US. In that same period, almost 900,000 deals were announced. Many were questionable, as Why Deals Fail shows. With companies expected to continue to merge in record numbers, it is time to learn some critical lessons from those deals. In 2014 the government of the UK -- one of the...