I have looked around the forum and can't find where this is addressed. I have been trying to make a economy mod. Mainly adding gold prices to city improvements, and other stuff in order to get rid of that late game run away train feeling and make buildings more expensive.

I have tried to do this by copying the KingdomUnlimitedImprovements.xml file, adding gold costs etc, then putting it in the mod file. However while it seems to recognize the file it doesn't seem to be replacing the old one just adding the new values to the old ones. For instance all my huts cost 2 food, and my studies show their knowledge production and upkeep twice. I would appreciate any help.