The Affordable Care Act (ACA) — otherwise known as Obamacare — has come under scrutiny in recent weeks with high-profile withdrawals from the system by some major insurance companies that complained about losing money by participating. These include Aetna, UnitedHealth Group and Humana. It has also been an ongoing presidential campaign issue, with the program meriting a mention in the recent vice presidential candidates’ debate. But Obamacare has performed reasonably well given how new it is, with many large insurers choosing to stay involved, according to Robert Field, an adjunct senior fellow at the University of Pennsylvania’s Leonard Davis Institute of Health Economics as well as a Drexel University professor. He notes that some of the problems that have cropped up in Obamacare could be solved with additional policy changes that don’t have to be onerous. A transcript of this Knowledge at Wharton interview with Field follows.…