You’re talking products vs commodities.
Commodoties are what products are made from. You also have services, which connect the two.
As a product, the sandwich is replenished again and again. It’s value comes not from what it is, but from what it does: provides tasty, portable sustenance.
The city is the same thing. So long as people (paid or not) rebuild the city to the point that it serves its purpose (to house, employ, and entertain people), it will again generate value. A city is merely densely co-located products and services, which usually require commodities.
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