Hand labor? in country oil reserves? Horses and oxen? for food production. I don't think that they had electric tractors...How people moved in towns doesn't interest me as much as ag.  Without ag...?
In country food reserves, most Swiss agriculture is alpine (i.e. herding).  Every square meter was hand planted in cities & towns.  Nearby areas suitable for row crops were tilled by hand (also grapes & orchards).  And agriculture got the oil that was left over after the army training, police and medical uses.

Potatoes. for example, can be cultivated by hand quite effectively.