Despite an outward appearance of stability, the core of the global monetary system today is immersed in a level of intellectual turmoil not seen since the breakup of the Bretton Woods system in the early 1970s. Back then, it was the system of fixed exchange rates that constrained central banks (except for the United States at the center). More recently, the key constraint for central banks is the zero lower bound on nominal interest rates. The zero bound has its roots in a diverse range of frictions but is due above all to the fear of central banks that if they push the short-term policy interest rates, which they set, too deeply negative, there will be a massive flight into paper currency. Cash, of course, pays no interest, positive or negative. This paper asks whether, in a world where paper currency is becoming increasingly vestigial outside small transactions (at least in the legal, taxcompliant economy), there might exist relatively simple ways to finesse the zero bound without affecting how most ordinary people live. Surprisingly, this topic has been relatively obscure during the past decade compared to the massive number of articles, well-represented in top journals, that take the zero bound as given and look for out-of-the-box solutions for dealing with it. In an inversion of the old joke, it is a bit as if the economics literature has insisted on positing "assume we don't have a can opener," without considering the possibility that we might be able to devise one.