The NBA generated more basketball related income than ever this past season, the total number coming up just short of $9 billion. Business is good. The first night of free agency underscored how good. Nikola Jokic, Bradley Beal, Devin Booker, Karl-Anthony Towns and Ja Morant agreed to extensions worth more than $1 billion by the time they expire, highlighting the moves made Thursday when the NBA’s annual free-agent negotiating window opened.