Aggregate demand and aggregate supply

        video on aggregate demand and aggregate supply: https://www.youtube.com/watch?v=oLhohwfwf_U https://www.youtube.com/watch?v=k_fBAYEepco&t=1478s 1. Why is the aggregate demand curve downward sloping? 2. What factors may cause the short run and the long run aggregate supply curves to shift? 3. What is the Classical view of economic management and how is this different from Keynesian's view?