In an industry with low margins, high labor costs and a shrinking commercial base, consolidation is king. That could be the motivation behind LifePoint Health's multibillion-dollar merger and buyout, according to some health care industry experts. Brentwood-based LifePoint (NASDAQ: LPNT) announced Monday that it has agreed to be sold to private-equity fund Apollo Global Management in a $5.6 billion transaction. As part of the deal, LifePoint will merge with fellow Brentwood-based company RCCH...