To be a Mega Corp with wage slaves, just make a Authoritarian Empire that is the Corporation.It's really not a big deal as I'll probably mod this out but I'm curious to know the reasoning. I understand oligarchy as a requirement but unmodded, I can't create a mega Corp with wage slaves.
Asuming this is the one we are talking about:
Corporate Dominion
*+10% Energy Credits
*Egalitarian, Oligarchic Authority
The things is that Energy was always a thing of Individualist/Egalitarian/Capitalist market:
Up to 1.4 they were the ones with teh Galactic Stock Exchange, Private Colony Ship and Hyper Entertainment Forum. All things that cost or produce a ton of Energy.
On top of the Pop modifiers, wich were a bit less consistent but generally tended to increase Energy production.
Either Authoritarian has another way to add a Energy Credit income bonus.
Or they can not get a Energy Credits income bonus on top of thier Mineral Income Bonus (from Slavery and lower living standarts even for free ones).