1. National income is the total earnings by the permanent residents of a country in a year
2. Output
   1. Double Counting
      1. Avoided
   2. Depreciation
      1. excluded
      2. the fall in value of capital as a result of age and usage
3. Income
   1. Transfer payments
      1. excluded
   2. Incomes in kind
      1. included
      2. non-monetary payment
4. Expenditure
   1. Foreign trade
      1. included
   2. Indirect taxes/Subsidies
      1. included
   3. Depreciation
      1. excluded
5. Corrent and constant prices
   1. nominal changes
      1. monetary value changes
   2. real changes
      1. physical change in goods and services