Sanusi SM. Price Transmission and Signals of Cowpea Across Zones and Value Chain in Niger State of Nigeria: Price Transmission and Signals of Cowpea Across Zones and Value Chain in Niger State of Nigeria. AEXTJ [Internet]. 2020 Jan. 3 [cited 2024 Jul. 3];3(4). Available from: https://aextj.com/index.php/aextj/article/view/188