The document discusses several studies that examined the impact of high-salaried designated players in MLS. Some of the key findings include: 1) Spending more money on player salaries did not necessarily lead to better competitive results for MLS teams according to a 2011-2012 study and a 2015 update. 2) Salary inequality among MLS players grew between 2011-2015 according to the Gini coefficient measure, indicating a few players received a larger share of total salaries. 3) High-profile designated players like David Beckham helped increase MLS ticket sales and jersey sales, demonstrating their off-the-field commercial impact for the league.