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Multiply all goods & services produced in 12 month period by their prices then add them up
Number of goods & services estimated every three months (quarterly) and then revised
intermediate products
second hand sales
nonmarket transactions
underground economy
fertility rate
life expectancy
net immigration
Education
Wealth
Changes in tax laws
Decline of unions; less manufacturing in U.S. than 40 years ago
More lower paying service jobs: movie theaters, restaurants, etc.
Discrimination
Changing family structure: