Trade goods:
Coffee
Wheat
Coral (required: 500,000 ducat investment)
Oil
Camel Hair
Gunpowder (required: 240,000 ducat investment)
Onions
Black Ore (required: 8,500,000 ducat investment)
Development levels required for trade goods to unlock:
Coral: 30,000
Gunpowder: 20,000
Black Ore: 85,000