Question

How did the Greeks trade among their colonies

Answer 1

The Greeks were great sea-farers, and travelling across the Mediterranean, they were eager to discover new lands and new opportunities. Even Greek mythology included such tales of exploration as Jason and his search for the Golden Fleece and that greatest of hero travellers Odysseus. First the islands around Greece were colonized, for example the first colony in the Adriatic was Corcyra (Corfu), founded by Corinth in 733 BCE (traditional date), and then prospectors looked further afield. The first colonists in a general sense were traders and those small groups of individuals who sought to tap into new resources and start a new life away from the increasingly competitive and over-crowded homeland.
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Answer 2

Traded Goods. Goods which were traded within Greece between different city-states included cereals, wine, olives, figs, pulses, eels, cheese, honey, meat (especially from sheep and goats), tools (e.g.: knives), perfumes, and fine pottery, especially Attic and Corinthian wares.