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Long-run aggregate supply is how much we can produce with the resources we have. Short-run aggregate supply is how much we will produce if costs (wages and the price of resources) are slow to change when the price level rises.
Economic growth comes with investment, growth in the labor force, and by boosting productivity. The best way to boost productivity is through advancing technology and innovation.
Certain government policies can impact aggregate supply. Regulations and high marginal tax rates will reduce aggregate supply and shift it left. Deregulation and lowering marginal tax rates will tend to increase aggregate supply and shift it right.
Answer each question on a piece of paper. Then watch the solution video. Trust me, I make the answer look easy. If you don't try it first, you won't build up your mechanism for answering Assessment questions.