“Democrats once dreamed of societies whose political autonomy rested firmly on economic independence. The Athenians idealized what they called autarky, and tried for a while to create a way of life simple and austere enough to make the polis genuinely self-sufficient. To be free meant to be independent of any other community or polis. Not even the Athenians were able to achieve autarky, however: human nature, it turns out, is dependency. By the time of Pericles, Athenian politics was inextricably bound up with a flowering empire held together by naval power and commerce — an empire that, even as it appeared to enhance Athenian might, ate away at Athenian independence and autarky. Master and slave, it turned out, were bound together by mutual insufficiency.