Hoyt has a good post on slow-slide economies (what I think'll probably happen) and what you can do to stay resilient: http://accordingtohoyt.com/2013/03/02/going-down-easy/
A condensed version: Have: 2nd (and 3rd) income streams, Skills that are of value to others (Anything from Carpentry to Cooking), a little bit on hand to have until the supply disruption/union strike/whatever clears up and shelves are stocked again (In a slow-slide... maybe a month's worth at least?).
Here's another good link for some recent history on economies who's currency's value has evaporated: http://www.munknee.com/2011/03/21-countries-have-experienced-hyperinflation-in-last-25-years-is-the-u-s-next/
Note, the above article was published in 2011. An updated article would surely list:
Greece, Spain, Portugal, Italy and more.