GROSS PRIVATE DOMESTIC INVESTMENT: Expenditures on capital goods to be used for productive activities in the domestic economy that are undertaken by the business sector during a given time period. This is the official item in the National Income and Product Accounts maintained by the Bureau of Economic Analysis measuring capital investment expenditures. Gross private domestic investment tends to be the least stable of the four expenditures, averaging between 12-18% of gross domestic product. See also | investment | investment expenditures | business sector | National Income and Product Accounts | Bureau of Economic Analysis | gross domestic product | gross domestic product, expenditures | aggregate expenditures | business cycle | investment business cycle | personal consumption expenditures | government consumption expenditures and gross investment | net exports of goods and services |