< Macroeconomics 
      Investment
| Investment is the expenditure(E) on new capital equipment which will be used to produce final goods & services(g+s) in the future. It includes building construction, housing, etc. | 
Factors Affecting Investment:
- The level of I is the most volatile component of AE, particularily because it is forward planning/focused.
Determinants
The level of investment in the economy is determined by:
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- Private sector investment comprises 10-20% of AE.
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