The 2011 NBA lockout was the fourth and most recent lockout in the history of the National Basketball Association (NBA). Team owners began the work stoppage upon expiration of the 2005 collective bargaining agreement (CBA). The 161-day lockout began on July 1, 2011 and ended on December 8, 2011. It delayed the start of the from November to December, and it reduced the regular season from 82 to 66 games. The previous lockout in 1998–99 had shortened the season to 50 games. During the lockout, teams could not trade, sign, or contact players. Players additionally did not have access to NBA team facilities, trainers, or staff. Negotiations between the owners, led by league commissioner David Stern, and the players, headed by director Billy Hunter and president Derek Fisher of the labor union National Basketball Players Association (NBPA), began in early 2011 and continued through November. The main issues dividing both sides were the division of revenue, the structure of the salary cap and luxury tax. Owners proposed to reduce the players' share of basketball related income (BRI) from 57% to 47%, but the players countered with 53% of BRI. Owners wanted to implement a hard salary cap and a harsher luxury tax, hoping to increase competition among teams, whereas players wanted to keep the current soft salary cap structure intact. As both sides failed to reach an agreement, the NBA canceled the preseason and all games through December. On November 14, the players dissolved the union, allowing them to file antitrust lawsuits against the league. On November 26, both sides reached a tentative agreement to end the lockout. The new CBA calls for a revenue split of 49-to-51.2% and a flexible salary cap structure with harsher luxury tax. After the tentative deal was reached, owners allowed players to have voluntary workouts at team sites starting December 1. After the deal was ratified on December 8, training camps, trades, and free agency began the next day. During the lockout, some players signed contracts to play in other countries, mostly in Europe and Asia, with most of them having the option to return upon the lockout's conclusion. The lockout also affected the economy outside the league due largely to cities that had teams in the league losing revenue generated by games as well as television networks that broadcast the league losing ratings and advertisement revenue due to games not being played. Chronology