The Bureau of Economic Analysis valued nominal U.S. gross domestic product (i.e., actual expenditure) at $16,420 billion at the end of 2012. Suppose that consumption expenditure was $12,210 billion, planned investment spending was $1,680 billion, and government spending was $2,970 billion.

a) Assuming goods market is in equilibrium, calculate spending on net exports.

b) If U.S. imports are valued at $2,100 billion, calculate spending on U.S. exports.