The United States today said it wants to introduce the concept of “differentiation” among developing nations in the trade negotiation on agriculture, a move that has been rejected by countries like India and China. Terming it “blood for water” or “blood for air”, the US said in a general council meeting at the WTO that some studies have indicated that it will have to make significant cuts in the outlays for domestic support under the present draft modalities. Modalities, in trade jargon, imply reduction commitments in tariffs and subsidies in agriculture and tariff cuts in industrial products.