Sargon of Agade said:
I have heard this rumor from the friend I play hot-seat with that if you go to war(and/or mobolize) all your buildings and wonders increase in cost... Is that true, through experience I have not seen that to be the case, so that is why I ask all of you. Thanks, SoA
1. All shield costs for building things are static except for the Palace.
The Palace's cost varies based on the number of cities that you have. I can't find the link, but the two main parameters are the number of cities you have and the Optimal City Number for your map/difficulty.
2. The only other exception is traits. Many traits halve the cost of certain improvements, but this never changes during a game.
3. MANY things change the number of shields that a city produces. Among them.
Corruption - creates wasted (red) shields
Golden Age - Increases the number of shields produced in a city.
Factory - Multiplies the base shield.
Mobilization - Increases shields produced, but as stated before, limits WHAT you can build.
When you mobilize, your city produces more shields, but those shields only apply to certain things that you build.
So in summary.
The cost never changes (except the palace)