Copied from an earlier post, food from Bazaar will likely not be as described. Thinking that it should be enough on it's own to support a size 4 or 5 city, no more.
Oasis
Buildable by adept/mage?
Delay of 10? turns to build.
Requires 5 tiles of buffer between oases. Only lets you have one per city, even with the Slums.
Ring of tiles surrounding the Oasis must be desert.
Granted +2 food by the Desert People tech, makes it a total of 5.
Beduin Improvements
Require two tiles of buffer space, allows for 4 per city, 5 with the Slums.
Bazaar Need a better name...
(.1?) food per square of unworked desert per trade route.
In a normal city, this is at most 15 squares, assuming all desert and the oasis and beduin improvements are constructed.
If you reach both Trade and Mercantilism, an inland city can have 5 trade routes. This allows for .1x15x5 food, or 7.5 food. Coastal cities have more trade, less desert, won't change too much. 7.5 food, along with the Oasis and Beduin Villages, is enough for a size 13 city.
(.2?) food per desert square while running Foreign Trade, allowing for a population of up to 18.
These amounts ignore flood plains, and will likely need to be tweaked.
The Slums would allow for up to 29 tiles of unworked desert, but as that is a relatively late wonder I don't think I should balance for it. If possible, I'd like the Bazaar to only count the first two rings, which would take care of this.
Any thoughts on this are more than appreciated.