The biggest problem will be in the cities where most people, who rely on others to provide their basic needs (food, water, etc.) will no longer have those services available to them. The time tables for these types of issues to go full circle is around 90 days.
What do you mean by full circle? Just in time shipping means that Walmarts will be empty in 2 days. No food, power, and water and you are looking at chaos very soon.