I can't say whether you actually will find this info in the game or not. But hardly any game manual or in-game information covers everything.
Carolus
Carolus
------------------------------------------------------------- Rising Maintenance Cost for Barracks ------------------------------------------------------------- The maintenance cost for the Barracks improvement increases by one gold each time it is rendered obsolete by a civilization advance. When first constructed the cost is one gold. After the discovery of Gunpowder and the Barracks is rebuilt it costs two gold. Finally, after the discovery of Mobile Warfare and the Barracks is rebuilt the cost is three gold.
The development of %STRING0 has rendered all existing Barracks obsolete. Antiquated Barracks sold for %NUMBER0 gold.
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