Professional traders can see that the item where the cursor is located is introduced.

I found the following on official website.

The names and types of traded goods are purchased in cities and sold in cities.

Saffron/Spice/Malaga/Plymouth, Amsterdam, Lubeck, Beirut, Hamburg, Altun, Jaffa, Athens, Candea.

Cinnamon/spice/Ceylon, local Chile/Seville, Genoa

Pepper/Spice/Kallikat, Venice/London, Plymouth, Lisbon, Marseille, Zanzibar, Muscat.

Laurel/Spice/Famagusta/Barcelona

Apple Vinegar/Spice/Calais and Seasoning (Process 4)/ Copenhagen, Guerder, Marseille, Genoa, Antwerp, sassari, Altun and Luanda.

Cocoa/Hobbies/San Juan, Santiago, Havana/Lisbon, London, Seville, Cape Town

Tobacco/Hobbies/Jamaica, Havana/Lisbon, Seville, Porto, Plymouth, London, Dover

Peanuts/Hobbies/San Juan, Santo Domingo, San Diego/Plymouth, Lisbon, Seville, London

Ximei/Hobby/Marseille, Tourist Food Supply (Trusteeship 2)/ Altun, Alexandria, Tunisia, Amsterdam, Edinburgh, Calais, Bordeaux.

Dried figs/hobbies/Jaffa, tourist food supply (storage 3)/ outside the Middle East

Dried apples/hobbies/Calais, food supply for tourists (Warehouse 4)/ Amsterdam, Oslo, Hamburg, Antwerp, Cape Verde, Altyn, Marseille, Genoa, Guerder.

Aguavit wine/liquor/places outside Bergen, Visby, secret liquor (Process 3)/ Norway

Whiskey/Liquor/London, Edinburgh, Dublin, Secret Liquor (Process 5)/Porto, Lisbon, Casablanca, Altun, Saint George, Seville, Madeira, Gijon, Mediterranean (excluding Islamic cultural circle) and Caribbean.

Sherry/white wine/Faroe wine (requires investment), abstruse wine brewing.