[tshaddox]

> Why not? I mean, you could ask the same question for 1 week, 1 month, 6 months, whatever.

Of course, that's why I'm asking! For some time periods there are some pretty obvious answers. A fairly routine natural disaster like a flood or blizzard could easily disrupt food access for a week. A month is probably more difficult to imagine, at least in very wealthy nations/regions. At 6 months I think it already starts to get difficult to imagine the scenario.