Full Idea
The analytic mark of possibility is the fact that mere positings (realities) do not generate a contradiction.
Gist of Idea
The analytic mark of possibility is that it does not generate a contradiction
Source
Immanuel Kant (Critique of Pure Reason [1781], B630/A602)
Book Reference
Kant,Immanuel: 'Critique of Pure Reason', ed/tr. Guyer,P /Wood,A W [CUO 1998], p.568
A Reaction
I think this is wrong. I would offer self-evident absurdity (but with no actual contradiction) as another analytic mark of possibility. Natural possibility may coincide with metaphysical possibility. Human thought does not determine possibilities.
Related Idea
Idea 21410 That a concept is not self-contradictory does not make what it represents possible [Kant]