The 50th birthday of New York private-equity giant Kohlberg Kravis Roberts – founded with $120,000 by the cousins George Roberts and Henry Kravis and now holding $758 billion of assets under management – is a moment to ask whether the modus operandi the firm pioneered has been good or bad for the world. Private-equity buyouts of underperforming public companies have certainly been a catalyst for sharper corporate performance across every western economy. But with what impact on society? READ MORE