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What may have precipitated such a large shift? Perhaps central banks are not too keen to pay interest on those euro-denominated assets--a condition imposed by the ECB when it cut its Deposit Facility interest rate to -0.10 in early June.
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A second cut to the deposit rate in September--combined with short-term yields in a number of European countries falling below zero--would not seem to bode well for a reversal in central banks' preference for holding euros.
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