Uh, you don't need a 100 yard field to 'play' football either. Likewise a baseball diamond. Otherwise you need a full court for a basketball comparison. You need 2 items for basketball, 1 for football, and 2/3 for baseball. Hockey's a different story (needing special conditions like ice unless you are playing roller hockey, also skates and a stick and a ball or puck).
The key to basketball is it can be played without anyone else AND it can be played on most any kind of surface. Also basketball can be played as an individual sport when learning/training how to play. The other's cannot, at least as easily.
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