In national-income accounting the category investment includes which of the following? Increasing the size of one's savings account Purchase of common stock in a corporation Purchase of rare coins B and C None of the above Choose the most correct answer by clicking a button, or by typing a letter from the keyboard and pressing the tab key. Can any of the four categories of GDP expenditures have a negative value? No; they all must be positive because negative spending makes no sense. Yes; Net Exports can be negative if imports are larger than exports. Yes; Investment can be negative if depreciation is larger than spending on new machinery. Yes; Government Spending can have a negative value if the government is running a deficit. Choose the most correct answer by clicking a button, or by typing a letter from the keyboard and pressing the tab key.