Every 3 turns your production, growth, or commerce must grow, so if every 3 turns you build an improvement, one of your cities grow, a building which increases one of these is built, your stability should rise.
....
Does this just mean base (tile and trade-based) commerce * building mods, or do specialists and buildings that add directly also count?
Also, does it it all count, regardless of how divided among science/gold/culture?
Thanks in advance.