The Minoans and the Myceneans both depended on trade due to the scarcity of raw materials and other resources in their own territories.
The Minoans were an island civilization, and all island civilizations need trade to be successful due to the scarcity of materials on the island.
The Myceneans had the same difficulty on mainland Greece. It imported raw materials from all over the Mediterranean, and then used its developed infrastructure and society to manufacture and export finished goods.