Complete the Correlation

1. …… : C + I + G + (X-M) :: GNP : C + I + G + (X-M) + (R-P).
Ans:- GDP

2. Output method : ………. :: Income method : Factor cost method
Ans:- product method or inventory method

3. Theoretical difficulty : Transfer payments :: ………: Valuation of Inventories
Ans:- Practical Difficulty