Definicija: The main aim of the single payment is to guarantee farmers more stable incomes. Farmers can decide what to produce in the knowledge that they will receive the same amount of aid, allowing them to adjust production to suit demand. To be eligible for the single payment, a farmer requires payment entitlements. These are calculated on the basis of the payments received by the farmer during a reference period (historical model) or the number of eligible hectares farmed during the first year of implementation of the scheme (regional model).
Vir definicije: http://ec.europa.eu/agriculture/markets/sfp/index_en.htm