A year ago, Congress overhauled the way drugs for older Americans get paid for, by giving Medicare the power to bargain with drug makers over prices in the biggest change to health care for more than a decade. This week, the Biden administration began its implementation. Sheryl Gay Stolberg, who covers health policy for The Times, discusses the decades long battle for bargaining power and Rebecca Robbins, who covers the pharmaceutical industry for The Times, explains its potential to reshape the business of drugs in America. Guest: Sheryl Gay Stolberg, a Washington correspondent covering health policy for The New York Times.