His later discovery of the New World brought prosperity to the Madeiran  the island's strategic location on the great East-West trading route meant that ships anchored and took on food, water, and the valuable trading commodity of Madeira wine.
Salt was the most valuable trade good for Madeira.
mnli hypothesis: Salt was the most valuable trade good for Madeira. premise: His later discovery of the New World brought prosperity to the Madeiran  the island's strategic location on the great East-West trading route meant that ships anchored and took on food, water, and the valuable trading commodity of Madeira wine.