The last time two mergers this huge were announced on the same day, Exxon was targeting Mobil and Bill Clinton was still in the White House. Halliburton Co. (HAL) and Actavis Plc this morning announced a combined $100 billion in takeovers. It’s rare to see two deals of $20 billion or more hit the tape at once — so rare, it hasn’t happened in 16 years, according to data compiled by Bloomberg. That’s when energy giant Exxon Corp. agreed to buy Mobil Corp. and two European drugmakers struck the merger that created Aventis SA. The two takeovers added to what has already been the busiest year for deal making since the record in 2007. “There’s a little bit of coincidence involved in this, but the broader stroke that I would paint is confidence is getting stronger,” said Scott Rostan, founder of Training The Street, an educational firm that teaches […]