leave within the first year. Despite this turnover rate, the company is still able to affect unemployment rates. This was found in a study by Oklahoma State University which states, "Walmart is found to have substantially lowered the relative unemployment rates of blacks in those counties where it is present, but to have had only a limited impact on relative incomes after the influences of other socio-economic variables were taken into account." Walmart is the largest private employer in the United States, with 1.6 million employees as of 2020. Walmart employs almost five times as many people as IBM, the second-largest employer. Walmart employs more African Americans than any other private employer in the United States. While 4.6% of all retail workers, and 16.5% of all US grocery workers, were unionized as of 2020, Walmart does not employ unionized labor and actively discourages unionization and collective bargaining. Walmart rebranded their Associate Education Benefits to Live Better U in March 2019. Live Better U supports associate education at every level and includes $1 a day college program, cost-free high school education, and discounts on higher education programs through partnership with Guild Education. In April 2019, Walmart Inc. announced plans to extend the use of robots in stores in order to improve and monitor inventory, clean floors and unload trucks, part of the company's effort to lower its labor costs. In June 2019, Walmart Inc. announced the expansion of education benefits to recruit high school students. The incentives include flexible work schedules, free SAT and ACT preparation courses, up to seven hours of free college credit, and a debt-free college degree in three fields from six nonprofit universities. Gender In 2007, a gender discrimination lawsuit, Dukes v. Wal-Mart Stores, Inc., was filed against Walmart, alleging that female employees were discriminated against in matters regarding pay and promotions. A class action suit was sought, which would have been the nation's largest in history, covering 1.5 million past and current employees. On June 20, 2011, the United States Supreme Court ruled in Wal-Mart's favor, stating that the plaintiffs did not have enough in common to constitute a class. The court ruled unanimously that because of the variability of the plaintiffs' circumstances, the class action could not proceed as presented, and furthermore, in a 5–4 decision that it could not proceed as any kind of class action suit. Several plaintiffs, including the lead plaintiff, Betty