Explain how the author's lack of detailed description adds to the believability (and inhumanity) of the events in "The Lottery."

I actually feel that there is a lot of detailed
description in this story, but I suppose your question is refering to the way in which
the fate of Tessie and the nature of the lottery is not described in detail and just
happens, which of course heightens the element of shock in the
story.

Jackson's style is one of evasion and surprise, as
she almost ambushes us with the last few paragraphs that make clear the inhumanity of
these group of villagers. I normally read out this story to my Senior students each
year, and it is fascinating to watch their responses as they gradually get bored about
this story they think is about some kind of village celebration, and then get shocked
and ask me to repeat bits when I get to the end because they can't believe it ended so
suddenly and so horrifically.

And yet, Jackson deliberately
uses this strategy to emphasise the way in which such communal violence and strict
adherence to traditions, even when it goes against our own values and judgement, is a
feature of all of our lives, no matter where and when we live. Violence and murder are
presented as simmering only a short way beneath the polite and civilised exterior that
make up humanity, and the way in which this village meeting turns from one thing into
something completely different so rapidly only highlights this fact, as we are left with
the image of Tessie Hutchinson screaming "It isn't far, it isn't right" as her friends
and family descend upon her.