“…Regression coecients are allowed to change gradually when moving from one group to another: PSTR is a regime-switching 5 Indeed, most of the studies dealing with developing and emerging countries have been concerned with the impact of current and targeted domestic biofuel production on land or agricultural commodities' availability, on water resources required for cultivation and on food prices (see, e.g., Khanna, Onal, Chen, and Huang, 2008;Yang, Xu, Zhang, Hu, Sommerfeld, and Chen, 2011;and Khanna and Crago, 2012). The main exception is Chakravorty, Hubert, and Marchand (2015) who have addressed the impact of US biofuel mandate on poverty in India.…”