because of the Affordable Care Act ("Obamacare"). NRF supported legislation passed by the House to repeal the Affordable Care Act and its employer mandate, which requires businesses to provide workers with health insurance at levels dictated by the government. Since passed in 2010, the law has forced some retailers to keep payrolls below the 50-worker level for triggering the law and to keep workers below the 30-hour a week definition of full time that requires coverage. The measure passed the House but died in the Senate. NRF defeated an effort to repeal debit card swipe fee reform that has saved retailers and their customers an estimated $8 billion a year since 2011, blocking an effort to allow the card industry to resume price-fixing of debit card fees. NRF helped convince the Department of Labor to reverse an expanded definition of “joint employer” that exposed companies to easier unionization and increased lawsuits over labor disputes. The NLRB also reversed a ruling that allowed the creation of “micro-unions” that would have allowed individual stores within a retail chain to be separately unionized or even individual departments within a store. NRF Senior Vice President for Government Relations, David French, was named a top lobbyist by The Hill newspaper for the seventh year running. 2016 NRF led the retail industry in helping defeat proposed regulations that would have required companies to pay overtime to millions of more workers. The rules would have driven up costs for employers, and the NRF argued that it would also take away worker flexibility important to career advancement and result in little or no increases in actual take-home pay. NRF challenged the law in a suit with 21 states and dozens of business groups resulting in an injunction that kept the proposed expansion from taking place. Conferences In 2018, Big Show had more than 300 speakers, 500 exhibitors, 36,500 attendees and 500 sessions. In 2019, Big Show had 500 speakers, 700 exhibitors, 37,000 attendees and 500 sessions. In 2020, Big Show had more than 300 speakers, 800 exhibitors, 40,000 attendees and 200 sessions. Leadership In mid-March 2010, the NRF announced that Matt Shay, who had headed the International Franchise Association (IFA), would become NRF's president and CEO on May 10, 2010, replacing Tracy Mullin, who was retiring. Mullin joined NRF in 1976 and became president in 1993. Shay joined the IFA in 1993 and was named president in 2004