EVERYTHING that exists, taught Aristotle, is the same as itself, and is different from everything else. During the hot years of the euro crisis, leaders of the most troubled economies sought desperately to remind investors of this eternal truth. Portugal, insisted its politicians, was not Greece. Nor was Spain Portugal, Italy Spain or France Italy. In short, the problems of one country were distinct from those of others. Yet the bond markets, disinclined to follow ancient wisdom, saw things differently. The contagion caused by spiralling borrowing costs leaping from one country to the next was one of the most alarming features of the crisis—and it explained how problems in tiny Greece could threaten the single currency as a whole. For a time, whenever a finance minister assured investors that his country was different, one could bet that it would suffer the same treatment.Lately the euro zone has appeared better protected. In June 2012, with Greece in political turmoil, yields on Spanish ten-year bonds topped 7%. This week they were near record lows, despite the election of an explicitly anti-austerity government in Greece. The early antics of Alexis Tsipras, the...
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