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

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.

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