A negative deposit rate would tend to push down the value of the euro against the dollar and other currencies, because investors would earn little or no return on euros. [and revert a lot of money from the north to the south where it belonged at the start 2008 crisis].
Jack Ewing (Sintra, Portugal), «E.C.B.seeks a strategy for staving off deflation», International New York Times, Tuesday, May 27, 2014, p.15