NET 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, after deducting capital depreciation. More specifically net private domestic investment is found be subtracting the capital consumption adjustment from gross private domestic investment. It's primary function is to measure the net increase in the capital stock resulting from investment. See also | investment | gross private domestic investment | depreciation, capital | capital consumption adjustment | business sector | National Income and Product Accounts | Bureau of Economic Analysis |