A good question. I dunno. A slow collapse like Argentina? (www.ferfal.blogspot.com an Argentinian blogger)
Or fast like the novel “Patriots” ?
http://www.amazon.com/gp/product/156975599X?ie=UTF8&tag=survivalcom-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=156975599X
(www.survivalblog.com JW Rawles)
Scary stuff.