It was an intention of the scheme to 'decouple' grant payments from production. This was in response to criticism from other World Trade Organization (WTO) countries (mainly the US), that the EU was unfairly subsidising farmers and providing an unfair competitive advantage. Under the SPS the farmer is no longer paid different amounts according to the crop he or she produces, but a set amount per hectare of agricultural land maintained in cultivatable condition. The intention is that choice of crop is based purely on market driven forces and not on production based grants. Decoupling of payments has allowed them to be categorised under the so-called blue box for the purpose of WTO negotiations, ensuring the legality and compliance of international obligations.