Аннотация:In this article the aggregate demand–aggregate supply model (briefly AD–AS model) was applied to explain price level and output through the relationship of aggregate demand and aggregate supply on example of the USA economy. Based on the theory of John Maynard Keynes it was shown that the model is adequate and there is room to improve this model or even establish new ones based on the results of this study. As with many models, a definitive answer may be found as to what exactly and how it describes aggregate supply and aggregate demand.