Bonuses to Wonder Production

[Kung-Fu knight]

I'm curious about how the various production boosts for wonders (and I suppose for all other similar boosts) actually work in this game. For example, lets say you have Autocracy and Monument to the Gods or Brussel's suzerain bonus. Do those boosts stack and if so, do they stack additively or mutiplicatively? I always thought that they didn't stack to prevent you from just rushing early wonders too easily but I could be wrong.

 

[yung.carl.jung]

I am pretty sure they do stack and I think they stack additively, only Magnus (for chops) works multiplicatively iirc.

 

[DanQuayle]

Additive: Autocracy, Brussels, Corvée, etc. (rounding is slightly off)
Multiplicative: Magnus, Ik-Kil