Stardock Forums
Why does my homeworld have 20 billion people, 4 healing pools and only 68% morale when several other of my planets have 16 billion, 1 healing pool and 100% morale? I also have 2 morale resources maxed out in mining.
Because the negative effect of population on morale very much resembles an exponential function that really kicks in around the 15-16 bil mark. The morale gap between 16 Bil and 20 Bil is rather huge, as seen in your example above. 
If you mouseover the morale readout on the planet screen you can see the breakdown of how morale is calculated.
68% morale is fine. Your party isn't going to be voted out just because one planet is a bit overcrowded.
My understanding is that happiness is also dependent on Planet Quality. The other planet probably has a higher Planet Quality than your home planet and can support an overall larger population because of that.
The Planet Quality morale bonus applies for all planets that are, or have become, a class 11 or higher. As the homeworld starts out as a class 10, you can give it a morale boost by researching Soil Enhancement and converting the yellow tile into a green one to make it a class 11. However, anything above that doesn't matter for morale. Also, even the +10 morale isn't enough to make a population of 20B or more financially attractive. Do not cross the threshold of 16B for good planets (except perhaps if you have several approval bonus tiles, but even then it's iffy), it simply doesn't pay off if you want to make as much money off your population as possible.
I dont go over 16B population per planet unless the morale tiles have big bonuses as over population kills morale
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