The plan's highest priority, however, was to develop agriculture by integrating the collective and individual sectors into an overall system emphasizing intensive cultivation and crop specialization and by employing science and technology. Economic policy encouraged the development of the "family economy"; that is, the peasants' personal use of economic resources, including land, not being used by the cooperative. Through use of an end-product contract system introduced by the plan, peasant households were permitted to sign contracts with the collective to farm land owned by the collective. The households then assumed responsibility for production on the plots. If production fell short of assigned quotas, the households were to be required to make up the deficit the following year. If a surplus was produced, the households were to be allowed to keep it, sell it on the free market, or sell it to the state for a "negotiated price". In 1983 the family economy reportedly supplied 50 to 60 percent of the peasants' total income and 30 to 50 percent of their foodstuffs.