Lessons for Draghi From a Land of Sub-Zero Interest Rates

``Why [the Danish experience of ineffective negative interest rates since 2012]? Simply put, a weak economy makes interest rates a less powerful tool than central bankers would like. "If you're very busy worrying about the economy and your job, you don't care very much what the exact rate is on your car loan," says Torsten Slok, Deutsche Bank's chief international economist in New York.''