Who Warned "Be Careful What You Wish For... If Interest Rates Go Negative"
Now that the Bank of Japan has joined other central banks such as Denmark, Sweden, the ECB, and Switzerland into pushing its rates into what until just two years ago was considered the monetary twilight zone below the zero bound, and in the process sending a record $5.5 trillion in government bond yields negative...
... which quickly puts into in context all the recent warnings about physical cash being eliminated (because as a reminder negative rates and cash simply can not coexist as the latter provides a ready immunity from the former), such as the following: