Should be CG production
Consumer Good : 1 * [Racial Modifier] * (1 + [Industry Research] / 10) = cg's per raw material
Agriculture (GC)
(agri) x [ 1 + (.1 x research lvl) ] x (1 + [race mod / 100]) x (market price) = per turn
income
Tax (GC)
(pop / 2) + ( ( pop x loyalty / 5000) x racial attribute)
this taxation is calculated individually for each and every planet, so an average (or
overall) calculation may be slightly different.
Chances of finding artifacts
Planet type = range from +25% to -20%
Time of day = range from +40% -100%
Race = range from +20% to -25%
Paid Account = +20%
Your Resources = +20%
The calculation is accumulative in this way, for an example say the base difficulty is 100 points:
100 - 20% - 20%
= (100-20) - 20%
= 80-20%
= 80-16
= 64
And i believe planet mods are added to the total