city = {
	# Merchant's Guild, gives additional income
	ct_merchant_guild_1 = {
		gold_cost = 128
		build_time = 365
		ai_creation_factor = 150
		extra_tech_building_start = -1

		tax_income = 2.5

		trigger = {
			TECH_CITY_CONSTRUCTION >= 0
			city_building_allow = yes
		}
	}
	ct_merchant_guild_2 = {
		upgrades_from = ct_merchant_guild_1
		gold_cost = 256
		build_time = 547
		ai_creation_factor = 150
		extra_tech_building_start = 1.2

		tax_income = 2.5

		trigger = {
			TECH_CITY_CONSTRUCTION >= 3
			city_building_allow = yes
		}
	}
	ct_merchant_guild_3 = {
		upgrades_from = ct_merchant_guild_2
		gold_cost = 512
		build_time = 1095
		ai_creation_factor = 150
		extra_tech_building_start = 1.2

		tax_income = 3

		trigger = {
			TECH_CITY_CONSTRUCTION >= 6
			city_building_allow = yes
		}
	}
}