That's a really good one.
When I saw Trade, Diplomacy, Nice, Mean and Alliances in the Tech-tree, my first thought was "Are we starting from Adam and Eve?"
On second thoughts, I realized that Trade could be explained as a process for getting inter-planetary and inter-stellar trade organized. So the entry would be something like:
The Senate passed the Hansen Bill in its session today. Having been under way for [months spend in reaserch], the Bill formalizes the issues of taxes paid on commerce between the Earth, her colonies and the Alien Races.
The Bill was passed by an overwhelming majority, due to a varity of issues and the confusion that has plagued the authorities for so many years.
According to government spokesbeings and diplomatic envoys, the effects of the Bill will be an estimated 15%
increase in the volume of commerce.
Effect: Production and Economy is increased by 15% on all your planets.
The same approach could be used for the other "simplistic" techs: That the procedures has to be formalized. This would especially explain Diplomacy, Nice and Mean - since they would be the adoptation of a formalized way of communicating political messages and conducting foreign policy.