Expenditures for consumer goods and services $4,565 
 Exports $740 
 Government purchases of goods and services $1,465 
 Social Security taxes $510 
 Net investment $225 
 Indirect business taxes $520 
 Imports $825 
 Gross investment $865
  Corporate income taxes $185 
 Personal income taxes $750 
 Corporate retained earnings $45 
 Net foreign factor income $20 
 Government transfer payments to households $690 
 Net interest payments to households $0
 On the basis of Table, depreciation is
 a. $640 billion.
 b. $50 billion.
 c. $85 billion.
 d. $690 billion.