- - - *Exploit how ministries pay no upkeep* - - - Ministry cities and units do not require upkeep in firebirds or money. They still require the input resources if they are of a producing city type. In vanilla, this tactic is short-reaching, but for mods that add units of significant expense in upkeep cost, one can sustain a surprising amount of upkeep-free cities and units. Do note that if building a lot of ministry cities, you might not receive taxation from them. In addition, you may find your built-up units to be in the hands of a rival or enemy should you fail to adequately control the distribution of ministries.