Raggytash if anyone had a grain of sense they would stockpile necessities in case of any event that destroyed supply chains. It may be very clever to have just in time deliveries and no doubt has accountants drooling, but just consider how long those supply chains are and also   how vulnerable.
A forecast of leaves on the line, or a light snowfall in 6 months time has the supermarkets out of bread and milk in an instant. Any kind of real crisis would cause havoc. I believe Maggie wound down emergency stockpiles with the ending of the cold war. A total embargo would have us out of fuel and food in less than a month I believe. If the average person has a weeks supply of food I would be surprised.
You may put your trust in government, I prefer tin cans.