What is required to be added to Net National Product at market prices to obtain National Disposable Income?

Option 1 -> Current transfers to the rest of the world are outgoing transfers and would need to be subtracted, not added.

Option 2 -> Profits net of corporate taxes are part of income distribution within the economy, not a component for converting NNP to National Disposable Income.

Option 3 -> Net current transfers from the rest of the world (transfers received minus transfers sent) must be added to NNP at market prices to arrive at National Disposable Income.

Option 4 -> Profits net of retained earnings relate to dividend distribution and are already accounted for in national income measures.

Hence, Option 3: Other current transfers from the rest of the world -> National Disposable Income represents the total income available to a nation for spending and saving. To convert NNP at market prices to National Disposable Income, we add net current transfers from abroad. These transfers include remittances, gifts, grants, and other unilateral transfers received from foreign countries. The formula is: National Disposable Income = NNP at market prices + Net current transfers from rest of the world. This adjustment accounts for income received without providing goods or services in return. -> correct