Not a business
Analogy:
Business: Bake a vanilla cake you get a vanilla cake (quality varies)
The outcome is (mostly) certain
Trading: Bake a vanilla cake, sometimes you get a vanilla cake (enormous quality variations), sometimes you get a chocolate cake (enormous quality variations).
The outcome is (totally) uncertain.
Analogy:
Business: Bake a vanilla cake you get a vanilla cake (quality varies)
The outcome is (mostly) certain
Trading: Bake a vanilla cake, sometimes you get a vanilla cake (enormous quality variations), sometimes you get a chocolate cake (enormous quality variations).
The outcome is (totally) uncertain.