In Cities: Skylines, how do I increase RCI demand? What factors affect it?
In one of my cities, I've got a population of 100,000. It essentially consists of one giant grid-city in one area. Traffic gridlock is commonplace there. Yet RCI demand exists at about 10%, allowing the city to grow at a moderate pace.
But in another city that I have, the population is around 50,000. Traffic runs smoothly. But RCI demand is almost non-existent.
In both cases, I have all services at full coverage for all buildings. I heard that traffic and service problems can affect RCI demand, but in all my subsequent cities, my traffic and service coverage is undoubtedly better, yet there are still problems.
In addition, I am aware that the game has a bug with commercial demand, where the existence of parks will lower it. I have installed a mod from the Steam Workshop to compensate for that.
Yet despite all I've done, RCI demand seems to be quite fickle. What I normally do to test this is place one of each type of zone: Residential, Commercial, and Office—I avoid Industrial due to its pollution, and since Office seems to be a nice substitute for it, as long as there are enough goods coming in to the city via Ship or Train. Then I see which zones have any buildings growing in them; the zones which have none after about five minutes of speed-3, I consider to be growing at 0%.