In the 1990s, big hospital systems in Pennsylvania engaged in an arms race for doctors' practices and rushed to buy or affiliate with independent hospitals. Then, the competitive frenzy produced a $2 billion statewide colossus called Allegheny Health & Education Research Foundation, but Allegheny filed for bankruptcy in Pittsburgh a decade ago. Moody's Investor Service has marked the anniversary by issuing a report that asks, "What have we learned?" Allegheny's collapse remains the nation's biggest bankruptcy by a nonprofit health system and in several ways, Philadelphia is still dealing with the fallout, according to this blog posting published in the Philadelphia Inquirer.