Undocumented research cost multiplier: about +0.75% per tech researched
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Have you ever wondered why it can sometimes cost significantly more to research a technology than what is indicated in the GalCiv data files? My hypothesis is that there is a undocumented research cost multiplier which scales in proportion to the number of technologies you already hold, and its value is roughly equal to +0.75% per technology you have, which may in turn be a result of distributing a +100% penalty over the 150 technologies in GalCiv (might exclude Smuggling I think). I have yet to find an exception to this in any of my games, and I would like to see if your experiences agree with mine before I start preaching about it