How do your answers compare with ours?
Answer:
Up to a point, some allowance is made for this in some National Accounts
Answer:
Not yet. This puts major uncertainties into comparisons between poorer countries that tend to have large self sufficient agricultural sectors and (often) richer countries that don't.
Answer:
No, though there is much controversy and estimates have been made.
Answer:
They are not included.
Answer:
Allowances are made for informal economic activity and some attempt is made to harmonise these across national accounts. However the extent to which some immoral, criminal or informal activities are included in money measures depend on declarations or estimates for tax purposes. It is obviously very difficult to harmonise standards or metadata in this area.