Additionally, you get boni from certain planets (aquatic, colonization events, etc). These are also expressed as percentages, which is partly what makes it confusing. So a 25% tourism bonus would apply to the 1% traffic tourism income .. making it 1.6 * 1.25 = 2.0
Second, there are various raw production modifiers. For example, a colony capital gives a flat +5 to total production. A Durantium refinery gives a flat +1 to total production. A racial trait, productive, gives a modifier to the raw production, depending on whether you take the first or second choice. A starbase factory at level one gives +1 Construction. And this latter does factor in because if you look at the raw output of a colony and destroy a nearby starbase factory, the raw production will decrease. In my observation it decreased by 1.25 per factory, suggesting it was being multiplied by the approval factor.
For example, from a save game I check a colony that had population of 4.0. It has an approval bonus of 25%, a colony capital bonus of +5, and a Durantium Refinery bonus of +1. (Curious that if I destroy the refinery I lose 1.5 to raw manufacturing instead of 1.25 as expected. Oh well). There are three lvl 1 factory starbases nearby. A racial trait of +1 to production (good question as to whether this gives a +1 to Raw Production as well as +15% to manufacturing...I am thinking it does!) gives a +15% bonus to manufacturing, and it has a reported Raw Manufacturing at 100% manufacturing of 19.1. Question is, how to get from this data to 19.1.
My guess would be 1.25 * (2 * 4^0.7 + 3 + 5 + 1 + 1) = 19.09 That's pretty close. (3 SB factories, a colony capital, a +1 production trait, and a Durantium Refinery). But problem is if I destroy the starbases and the refinery the calculation is now wrong: I get 14.1 instead of 15.3 as shown in game.
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