[Grandpa Kim]

I did some testing myself and came up with substantially the same results as Asmala. Using v.1.84 and keeping all factors default except happiness here is what happened.

Happiness setting_________Drop to indifferent date

100%___________________2400.3
105%___________________2400.5
110%___________________2400.5
115%___________________2400.5
120%___________________2400.5
125%___________________2400.5
150%___________________2400.5

using v.1.78

110%___________________2400.5

It looks like this Asmala is right, and this is the way its always been, yet it does seem to make a difference in the game. Seems awfully wimpy but it does work when combined with all other factors. Remember, this small bonus/penalty acts each and every turn.