Alternatively...

Alternatively, from a rather strange book called Great British Short Novels (circa 1970, which I bought for a quarter and from which I am currently rereading Heart of Darkness) we find this:

"Given its narrow confines, a short story cannot probe character beyond a few basic traits. It cannot allow for great scenic detail or elaborate plot to illuminate the conduct of its protagonist. Effective as a means for providing sudden insight or creating a powerful emotional impact, it cannot diffuse its focus to include anything beyond the immediately relevant." --from "Introduction: The Art of the Novella" by Robert Donald Spector