Try the book "Macroeconomics" by Blanchard, there you can read about the IS-LM and AS-AD models.
Could someone please explain the AS/AD model to me with regard to macroeconomics? Could you please give me some examples or recomend a good website to me that has a lot of examples?
For example, to show the effect of a stock market crash on the real output and the price level, the AD would shift to the left due to a distribution of income, and, as a result, the price level and the real output would both decrease, right?
If a policy is created to help the economy, it would shift the AD curve to the right and the real output would increase as well as the price level, right?
Thank you very much
you are quite right in both examples, but the government can only make the AD curve move to the right with its fiscal policies and in the long run unemployment is returned to its natural rate and during these years when inflation is high, unemployment is low.
AD/AS model is the most simplest economics model, it's just as what you see on the model (what you say), there is a bit different in the long run model and short run model, the AS curve is not a straight line in the short run
the demand curve can be a straight line or a curve, it depends on the market
have a look at this http://people.uleth.ca/~richard.mueller/MacroChap09.pdf
hope this helps