Won't be an economic system, so that shouldn't take long.
In living memory, gardens were what people ate. Shopping lists consisted of salt, coffee, sugar.
And yes, I trade my excess, or store it for a bad heat wave/winter. I've got stored pork products that didn't come from any store, enough to last until next spring, even assuming I don't take more ferals or get a deer or squirrel or 50.
As someone else said, you need to get out more, and find out what most of humanity has done for most of human history to survive. Instead of assuming your bubble world will persist.
/johnny
>>In living memory, gardens were what people ate. Shopping lists consisted of salt, coffee, sugar.<<
When you sent Hoss into town to restock the Ponderosa?
You might be quite fine in a self-contained farm of sorts. A handful might be.
But most people in the USA live in cities/suburbs. We rely on manufactured products such as gasoline, refined sugar (yes, that is manufactured), plastics, clothing, booze, etc.
It isn’t me that is in the bubble. You might be able to “survive” — but the entire globe to fall back to an Amish level of technology? Even Haiti isn’t there.
It doesn’t make any sense outside of adverse extraterrestrial intervention.