How did trade link the peoples of Africa, Asia, and Europe prior to 1492?

Historians now recognize that a type of world economy, known as the Afroeurasian trade world, linked the products and people of Europe, Asia, and Africa in the fifteenth century. Prior to 1492, the West was not the dominant player in world trade. Nevertheless, wealthy Europeans were eager consumers of luxury goods from the East, which they received through Venetian and Genoese middlemen.