“…They were unable to distinguish causes of inefficiency due to the biological nature of agricultural production from farm-specific differences in the use of available technology because they represented the sample farms' production process on an input-output space (production function) with a given technology. Since the 1970s, efficiency assessments have been undertaken in Indian agriculture, despite conceptual problems and analytical discrepancies (Huang and Bagi, 1984;Kalirajan, 1981;Junankar, 1980;Sidhu, 1974;Lau and Yotopoulos, 1971;Alam, Siwar and Talib, 2010;Tadesse and Krishnamoorthy, 1997;Suresh and Keshava Reddy, 2006;Bhagat, Singh and Vishwavidyalaya, 2007;Ajit Singh, H L Singh and V S Chaudhary, 2013;Agarwal, Yadav and Mondal, 2018;Meenasulochani et al, 2018;Paul, 2019;Sharma et al, 2019;Thayaparan and Jayathilaka, 2020; K.S.R., Paul, 2020); in fact, the latter two measured relative technical efficiency using shadow profit function. With particular reference to rice farming, the studies by Shanmugam and Palanisami (1993) in Tamil Nadu, Datt and Joshi (1992) in Uttar Pradesh, and Jayaram et al (1992) in Karnataka are among the prominent works.…”