Both in the short and the long run, systematic (ที่คาดการณ์ไว้,จะซ่ำแล้วซ่ำอีก) monetary policy did not have any effect on real variables
Only unexpected (unanticipated) changes in money supply (‘monetary surprise’) can have real effects on income and unemployment.
So, authorities can fund its monetary policy only on unanticipated changes, that is without announcing its intentions (is it compatible with democracy?)