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Balanced Emblematic District Inheritance

This mod brings the following changes to the cost formulas of Emblematic Districts:

● The baseline cost for Emblematic Districts has been reduced. EDs are limited to one per territory by default, so it doesn't make much sense to put another disincentivizing factor on it. The base districts keep their cost formulas as is. EDs will just be a little bit cheaper.
● If an inheritance mod is used, the cost of previous EDs will scale with the era offset. Constructing a pyramid during the Contemporary Era will be more difficult.
● The city count is considered as a secondary scaling factor. Building more cities instead of attaching territories will no longer be as exploitative as it is in vanilla.
● In turn, the district count scaling is smoothened a bit, especially in the earlier eras.

● Era 1: Source.EraLevel ^ 0.65 * (36 + 10 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.12) + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025
● Era 2: (Source.EraLevel - 1) ^ 0.68 * (38 + 12 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.12) + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025
● Era 3: (Source.EraLevel - 2) ^ 0.7 * (40 + 14 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.13) + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025
● Era 4: (Source.EraLevel - 3) ^ 0.75 * (45 + 16 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.13) + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025
● Era 5: (Source.EraLevel - 4) ^ 0.8 * (50 + 18 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.14) + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025
● Era 6: 60 + 20 * (Target.ExtensionDistrictsCount + Source.CityCount - 1) ^ 1.15 + ((Target.ExtensionDistrictsCount - 1) * 0.75) ^ 2.025

This mod only changes the ProductionCost_Extension_Emblematic_EraN definitions, can be combined with any other mod if applied afterwards in the mod order.
In order to use the optional inheritance feature, you will need another mod, such as Emblematic Districts Non-Obsolete[mod.io], or Compatibility Patch Community Seven[mod.io].
This mod has not gone through extensive testing yet, but carefully modeled on paper. Gameplay issues with the formula are rather unlikely.