Greece, Olive Oil and Trade

John Steel's NY Times book review of William J. Bernstein's "A Splendid Exchange: How trade shaped the world", comments:

"The poor soil and scant rain of ancient Greece, for instance, meant that the terrain’s ability to grow grain was limited, but grape vines and olive trees grew in abundance. To export its wine and olive oil, Athens developed a pottery industry to supply the jars in which those products were transported. As Greek trade, and colonies, flourished across the length and breadth of the Mediterranean and the Black Sea, naval power was needed to suppress piracy. To control choke points like the Dardanelles and Bosporus, which led to the rich grain lands of what is now Ukraine, the Athenian empire developed."