“…Methodological approach. Based on previous studies, we categorized the dissertations according to whether they used quantitative, qualitative, or mixed methods (Han et al , 2020; Jiang et al , 2007; Burgess and Singh, 2006; Sachan and Datta, 2005; Carter and Ellram, 2003). Quantitative methods comprised (1) mathematical and econometric modeling and simulation, wherein models and simulations were used to solve complicated practical problems; (2) survey, wherein a questionnaire was administered to collect data and test the hypotheses; (3) secondary data, wherein secondary sources of data from industry, government, or the stock market were used; and (4) experimental, wherein independent variables were manipulated to collect data and test their effects on dependent variables while controlling the effects of extraneous variables.…”