The NBA's Collective Bargaining Agreement (CBA) is not typically a topic of interest among NBA fans. Like most labor negotiations, the terms of the CBA tend to be less noteworthy to the general public than the fact that both parties reached an agreement, thereby preventing a boycott or lockout.
This past CBA was different. The concept of the second apron was introduced as a measure to ensure parity among teams with different budgets. Teams like the Warriors and Nets had the financial firepower to blow through the luxury tax, assembling rosters that are too expensive for smaller market teams to compete with.