4. The oil price shocks of 20062009: Between 2006 and the middle of 2008, oil prices rose sharplyfrom around $60 to more than $140 per barrel. By the end of 2008, however, oil prices had fallen even more sharply, to just over $40 per barrel. Think of these events as two separate shocks. (3) What, precisely, are the two shocks? (For the purpose of this question, let's ignore the signicant role played by the nancial crisis itself.) (b) Using the AS/AD framework, explain how the macroeconomy would evolve in response to these shocks