Marketplace (Eco) question- also a question about food stall vendors

Actually, I may have figured it out, at least partially.
I placed one of your builds in Newcrest instead, and the food vendors did show up, as did art and sales table vendors.
Now I think the San Myshuno vendors who show up to work the stalls in the plaza (neighborhood terrain) may interfere with the food stalls on-lot at the marketplace.