“…Second, we rely on the existing literature in the field of total factor productivity to select firm-level control variables, such as firm size, location of the firm and ownership identity (see, e.g., Lileeva and Trefler, 2010;Yang and Chen, 2012). Moreover, owing to the richness of the World Bank survey data, we are able to incorporate variables that refer to constraints in different dimensions faced by firms, such as financial constraint, illegal activity (see Chen and Guariglia, 2013;Liu and Li, 2017;Besley and Mueller, 2018;and Caggese, 2019) and the time that senior management spent on dealing with government regulations (see Xie et al, 2020 andLi et al, 2021). In addition, we also control for new products, which is a commonly used indicator for product innovation, to compare its impact on TFP with that of R&D investments.…”