Extra Construction costs (not OB costs)

Whats the calc for the extra building costs as empire grows? Looked for info on guide, couldnt find.

Is it a function of NW?

Our empire’s large size increases construction costs by 14.33%. formula for that?

Its about 10% per 100k nw.
I think it starts from about 10k onwards

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I found out from old spreadaheet.

Its (NW-10k)/1,000,000.

Ex.: 157k NW construction cost penalty = (157,000-10,000)/1,000,000 = 0.147 = 14.7% penalty.

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