Few statesmen have left such an indelible mark on economic policymaking as Shinzo Abe, Japan’s longest serving prime minister, who last week announced his resignation due to ill health.His signature programme – a three-pronged plan involving aggressive monetary easing, fiscal expansion and structural reforms, designed to rescue Japan from two decades of near stagnation and on-and-off deflation – enthralled financial markets when it was launched shortly after Abe became prime minister for the…