IMO, nationalism is about ensuring that every local group is self-sustaining, with good, fulfilling local jobs.
I want to see local banks, local factory workers, local bakers, etc. in every town or city, each providing a valued trusted, service for their own local, self-sustaining communities. This would provide plenty of reasonable jobs across multiple sectors.
I don't want to see opportunists muscle in with a centralized baking system shipping & selling baked goods across multiple communities, undercutting prices & putting all those local bakers out of business, & subsequently destroying both the social fabric of local communities and personal health as tragic side-effects. Destruction of said local jobs compel individuals to seek other employment which only serves to feed this destructive system, eroding individual ethics and morality in the process.