9,617 Nur Marahaini Mohd Nizar 2020-06-02 http://www.fao.org/economic/the-statistics-division-ess/methodology/methodology-systems/price-statistics-and-index-numbers-of-agricultural-production-and-prices/4-concepts-on-price-data/en/ FAO. (n.d.). 4. Concepts on price data. Retrieved from http://www.fao.org/economic/the-statistics-division-ess/methodology/methodology-systems/price-statistics-and-index-numbers-of-agricultural-production-and-prices/4-concepts-on-price-data/en/