Not entirely non-existent.Razorwing wrote:We know that the Change Cage cities tend to produce resources that they trade with each other... using the Bargefolk to carry these items from one city to the others... but no information on any trade with the other cultures. This is probably because such trade is almost nonexistant.
The Cities don't trade with another but the Barge folk (and the other cities via the Barge Folk)
but the Barge folk do trade with the Neobedouins and Skyfolk to bring in black market goods.
As the Bargefolk will trade items they find in the cities with the other cultures, the Neovics trade by proxy.
(and to a certain extent in Helium city too)
While the cities are horrible places, what they produce is very well made having honed and practiced what they are allowed to produce to an exceptionally high standard. So airship parts from Neovic cities are highly sought after.