Actually, Sunnydale is a fairly small town, it probably only has the one cemetery, and as far as I've heard the predator-prey numbers work out pretty consistent with what's shown in the show.

The real question is, what happens elsewhere? If Buffy's in Sunnydale, how is Cleveland going? Is Sunnydale somehow special? Or is there a curse associated with the Slayer, that bad things will happen around her? Or, as you suggest, is the rest of the country going really badly, with the government impotent to deal with the problem for some reason?


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