5. Which of the following statements is correct? 6 A. The advent of the "new economy" has been the most significant exogenous shock to affect the position of the U.S. economy relative to the rest of the world in recent years. B. The source of fluctuations in real and nominal exchange rates can be found in real shocks (e.g., technology and preference) and nominal shocks (e.g., money). C. The Balassa-Samuelson hypothesis explains why price levels are lower in poorer countries. D. All of the above. E. None of the above