Use an aggregate supply-aggregate demand model to answer the following question. Be sure to mention which curve shift which way and what is the result on output and price level. Consider only the short-run effects. a. Because of a war in Ukraine and sanctions on Russia, the price of cereals like wheat increases. b. The Canadian dollar suddenly appreciates. c. A rise in immigration leads to an increase in the Canadian labour force. d. The federal government announces a massive increase in military spending