What does an increase in the aggregate price do?

What will happen to the equilibrim price level and real GDP if aggregate demand and aggregate supply both increase?

• Answer:

  If aggregate demand increases at every price level than the demand curve shifts to the right. In the short-run the new equilibrium forms from an increase in willingness to spend, thus higher prices and higher real GDP or quantity of output. If short-run aggregate supply increases at every price level than the supply curve shifts to the right. From the short-run to the long-run the new equilibrium forms from an increase willingness to sell, thus prices reduce to original equilibrium and output increases further. Recap: Prices stay constant while real GDP or total quantity of output increases.