Greeks exported pottery, wine, and olive oil. In return they received grains and metals from the west, and they received fish, timber, wheat, metals, and slaves from the Black Sea region.
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The land was generally poor, so to gain food security, trade was used to buy external sources of food.
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it led to the development of the greek alphabet
It had limited land and sustained itself with trade with the Greek cities in Asia Minor, the Black Sea and Sicily. It founded the cities of Byzantium and Chalcedon in the east and Megara Hyblaea in Sicily.