What factors shift the long-run aggregate supply curve?

1. What is meant by the term price stickiness in the new Keynesian view? What explains price stickiness? 2. What factors shift the short-run aggregate supply curve?
3. What factors shift the long-run aggregate supply curve?
4. Use the equation Y = YP + a(P – Pe ) to explain why in the new classical view, the short-run aggregate supply curve is positively sloped and the long-run aggregate supply curve is vertical.