This is the starting form of government. You can do what ever you want, since have imperial control over the senate. You don't receive any economic bonuses, but your planets are more easily satisfied and hence are less likely to revolt.
complete control over the senate means that you retain your bonuses from your political party. Also, if you direct your civilization to declare war then it will without fail. Compare this with more advanced governments in which a vote must be won in the senate before your civilization can go to war.
- Economic Bonus: 0