For Private Equity, Dropping ER Docs Is a “Simple Equation” Private equity companies pool money from wealthy investors to buy their way into various industries, often slashing spending and seeking to flip businesses in three to seven years. While this business model is a proven moneymaker on Wall Street, it raises concerns in health care, where critics worry the pressure to turn big profits will influence life-or-death decisions that were once left solely to medical professionals. Nearly $1 trillion in private equity funds have gone into almost 8,000 health care transactions over the past decade, according to industry tracker PitchBook, including buying into medical staffing companies that many hospitals hire to manage their emergency departments.