https://www.federalreserve.govewsevents/speech/mishkin20080225a.htm. According to Phelps, since unemployment tends toward its natural rate depending on _ the inflation rate: O Policy makers can achieve permanently higher inflation without permanently higher unemployment Policy makers can achieve permanently lower inflation without permanently higher unemployment Policy makers can achieve permanently lower inflation at the same level of unemployment O Policy makers can achieve permanently lower inflation without permanently lower unemployment According to the article, a negative shock to aggregate demand causes an increase why in future inflation and an increase _ in actual output relative to its potential. Which of the following would be an appropriate policy response in order to stabilize prices? O An expansionary fiscal policy to keep inflation from rising O An expansionary fiscal policy to keep inflation from falling O An expansionary monetary policy to keep inflation from falling O A contractionary monetary policy to keep inflation from rising