IN THE WEEKS following the bankruptcy of Lehman Brothers in 2008, there was naturally concern about the security of deposits. Many judged cash was safer kept in hand than parked with a wobbly bank. Demand for banknotes surged. Discerning German hoarders were said to be stuffing their mattresses with euros with serial numbers prefixed by an "X", indicating they were printed in Germany. Numbers starting with a "Y" (Greece) or an "s" (Italy) were shunned.
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