商品
象牙
象牙，作为非洲除奴隶贸易外最重要的商品之一，被欧洲人广泛用于制作各类精致的物品，如餐具、家具以及艺术装饰品等。
定义in_game/common/goods/00_raw_materials.txt:281
282method = hunting
283category = raw_material
284color = goods_ivory
285default_market_price = 4
286ai_rgo_size_importance = 4
288demand_add = {
289nobles = 0.05
}
292development_threshold = 20
294wealth_impact_threshold = {
295all = 1.1
}
298sub_continent_demand_modifier = {
299south_asia = 1.2
}