Personal Taxes $23 Net Private Domestic Investment 33 Net Exports 6 National Income 278 U. S. Exports 20 Gross Private Domestic Investment 56 Disposable Income 220 Taxes on Production and Imports 32 Undistributed Corporate Profits 15 Proprietors Income 45 Net Foreign Factor Income Statistical Discrepancy Refer to the accompanying national income data. All figures are in billions of dollars. The gross domestic product is