Productive capacity is the maximum possible output of an economy. According to the United Nations Conference on Trade and Development (UNCTAD), no agreed-upon definition of maximum output exists. UNCTAD itself proposes: "the productive resources, entrepreneurial capabilities and production linkages which together determine the capacity of a country to produce goods and services." The term may also be applied to individual resources or assets; for instance the productive capacity of an area of farmland.[1][better source needed][2][better source needed][3][better source needed]