1. I want to understand the aggregate demand and supply and their differences ?

2. And what's the Short run and long run aggregate supply and demand ( what happens to the price level, unemployment , RGDP , inflation) - positive and negative shocks . I want to understand when these concepts appear in what kind of situations. I have difficulty understanding these concepts in a graph: I would like to get explanations like this one:Assume an economy experiences a negative shock in the aggregate demand, what happens to price and RGDP in the short run? Decrease, decrease.

In brief I just want to know in what kind of situations what decreases and what increases, what's neutral ... all the possibilities that might happen.

1. What causes stagflation?
2. What's potential GDP