Logistics

It reduces the cost of new starbase by 10%. This means that if you have a 100% bonus for logisitics, every starbase is free.

The cost of a building a starbase is something like:
cost = max((N - Nf),0)*unit cost * ( 100 - logistic bonus)/100,
where:
- N is the number of starbase you currently have
- Nf is the number of free starbase associated the the size of galaxy (ie the greater the galaxy, the more starbases you can build without spending money for the construction)
- unit cost: the cost of the first non free starbase
- logistic bonus: you empire wide logistic bonus. Currently, there are galactic achievements that help to increase the logistic ability.