VNU Journal of Economics and Business, Vol 1, No 2 (2021) 56 68 56 Original Article Efficiency of Bollinger Bands in Forward Operations for Agricultural Products in Vietnam Nguyen Thi Nhung*, Nguyen Thi Nguyet Nuong, Nguyen Ha Uyen VNU University of Economics and Busines,144 Xuan Thuy, Cau Giay, Hanoi, Vietnam Received 12 June 2021 Revised 15 July 2021; Accepted 25 August 2021 Abstract Using primary data collected from in depth interviews with 11 practical experts who have been working in the co[.]