A comment under a video on taxes and funding, stated that some of the info in the video might be outdated:
To people who are watching this video now: The colony growth funding has been heavily nerfed recently. I think its effect is only a third of what it used to be or something like that, so maybe now it's better to focus on colony happiness instead of growth funding? I dunno.
Not being aware of that, I wanted to learn more about it. So I opened that changelog for the Mercantile Update, and searched for funding. Didn’t find anything pertinent. I then went in the forums to do a search, and found the following in the changelog for version 1.2.9.5 (March 7th, 2025):
> ECONOMY
> adjusted ratio of empire funding (Research + Colony Growth) down from 50% to 25% of total Research and total Growth, thus ensuring higher baseline research and growth rate even without full bonus funding
Which, if I understand correctly, is a 50% nerf of the effect of growth and research funding. Important information to know about that game mechanic. But that info is completely absent from the Mercantile update changelog.