NIPA 6. Which of the following variables has the strongest correlation with real GDP in the data: C, I, G, or NX? 7. How would you classify how C, I, G and NX behave with regards to the business cycle (i.e. are they procyclical, countercyclical, or acyclical)? 8. Historically, what fraction of real GDP is made up on average by government purchases? 9. Which component of real GDP has the biggest share historically in the full sample? 10. Rank the following components of RGDP: real consumption, investment and government purchases, from the most volatile to the least volatile historically in the full sample