Food is produced locally with minimal to no reliance on technology. This is accomplished through gardens, livestock, and small farms. For variety, food is supplemented with imports, but imports are not a necessity. It was realized that this localization would naturally occur during an economic collapse, along with much starvation, so it was deemed a worthwhile preventative measure.
A secondary benefit, is the fulfilling activity and authenticity it provides to society, allowing people to play active roles in their own maintenance, harmonizing with their environment, allowing local communities to grow and build what they consume. But the goal is not isolation, as regional and global trade is welcomed as supplements to a foundation of self-reliance.
And beyond local food production, this civilization also encourages local manufacturing. Construction utilizes locally sustainable material, and dwellings are built for maximal energy efficiency to minimize heating/cooling usage. Clothing production is locally sustainable, but imports allow for more variety. Similarly, furniture and artwork are popular imports and exports.
This civilization therefore, is not reliant on strong centralized governments or multi-national corporations for survival — plus their self-sufficiency provides leverage against such powers. Additionally, if regional disaster occurs, other regions are not endangered through interdependence. And because of their production capabilities, all regions are able to lend aid to others in need.