Why did NBA have a lockout?

Related questions

1. Do you get paid during a strike?
2. Why do games get blacked out?
3. How long was the NBA lockout?
4. Why was the 2012 NBA season shortened?
5. When did the NBA start playing 82 games?
6. Are NBA TV games blacked out?
7. When did Stern retire?
8. What is a player lockout?
9. Who won the NBA championship in 2009 and 2010?
10. Is Michael Jordan an NBA owner?

Tags

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2. #lockout
3. #players
4. #stoppage
5. #trade
6. #during
7. #owners
8. #expiration
9. #teams
10. #december
11. #facilities
12. #bargaining
13. #collective
14. #could
15. #contact
16. #agreement
17. #began
18. #staffs
19. #ended
20. #access