It is certainly possible to grow vegetables and raise chickens in urban areas, although some jurisdictions may prohibit such activities. From an economic point of view, does it make sense?
Do you have any scientific studies that have examined these issues, and done the calculations? That would be very interesting for me to read and learn from.
Paul: The challenge is access to land. In an urban environment, land is very expensive and limited sue to all the buildings, streets, and parking garages.
if you have access to land at a reasonable cost, then it makes sense.