RBNZ's Wheeler: We've struggled to get headline inflation higher mainly due to 4 years of negative tradables inflation

More headlines keep crossing the wires from RBNZ Governor Graeme Wheeler's press conference, via Reuters:

• Lower exchange rate would help to reduce tradeables inflation and help get better balance to growth dynamics in the economy
• Monitors traffic light system for currency intervention closely, wont comment on whether currency strength is affecting the system
• One of the risks around global outlook is that markets assume central banks will remain accommodative for a long period
• We've struggled to get headline inflation higher mainly due to 4 years of negative tradables inflation