O A reduction of rates to combat rising inflation. O A rapid increase up until 4%. A reduction of rates followed by productivity gains. QUESTION 4 According to Chair Yellen's speech what is true about changes in productivity in the US labor market? . O Productivity growth has been accelerating since 2007 as people lost their jobs and the remaining workers had to work harder. O Productivity has been growing quite a bit less since 2007 than in the prior decade. The reasons for this are so far unclear. O Productivity growth has remained farily stagnant over the past 20 years due to headwinds of global competition