Prior to beginning work on this discussion, read Chapter 6 in the course text and respond to the following components: Discuss the reasons why the aggregate demand (AD) curve slopes downward. What causes the AD curve and aggregate supply (AS) curve to shift, respectively? How would a change in AD and AS affect the economy, respectively? Why do Keynesian economists emphasize AD whereas classical economists emphasize AS? Your initial post should be a minimum of 300 words.