Economic Definition of I. Defined.
Offline Version: PDF
Term I Definition: The standard abbreviation for investment expenditures by the business sector, especially when used in the study of macroeconomics. This abbreviation is most often seen in the aggregate expenditure equation, AE = C + I + G + (X - M), where C, G, and (X - M) represent expenditures by the other three macroeconomic sectors, household, business, and foreign.
Permalink: https://glossary.econguru.com/economic-term/I