Congratulations for making it to the end.
I would say the couple in the valley of motor company was foreshadowing. Lacking the structure of society and free commerce our support systems shrink to what is local.
Fresh produce from the other side of the world are replaced with canned and ling shelf life. Closets full of clothes for a different outfit every day will be reduced to one or 2 sets of clothes plus a Sunday best. Less laundry less ork to wash them.
I have to defer to
@Amish Heart t comment on how close the Amish societies are a model to look at and to what extent their interactions with the common folk. Around these part "Amish built" is a seal of quality fo houses sheds furniture and baked goods. But even they I feel would feel an impact.
Ben