The other citizens work the "city tile".
# Working the city tile gives at least one production resource and an amount of trade (0-5) that depends on the city population.
* Laborers (Pop 1-6): +1 production
* Vendors (Pop 7-12): +1 production, +1 trade
* Traders (Pop 13-18): +1 production, +2 trade
* Merchants (Pop 19-24): +1 production, +3 trade
* Importers (Pop 25-30): +1 production, +4 trade
* Exporters (Pop 31): +1 production, +5 trade