## 3 Econometric Analysis of the Behavioral Model
### Research Methodology
The main advantage of using PLS-SEM is the relaxation of the normal distribution assumptions required for the maximum likelihood method used in estimating models using CB-SEM, and the ability of PLS-SEM to easily estimate more complicated models based on a small sample sizes [48]. When models comprise many items and a large number of constructs, PLS-SEM has solutions for small sample sizes. recent papers [38; 49] explain how PLS-SEM provides solutions when other methods, such as CB-SEM do not converge \begin{table}
\begin{tabular}{c c} \hline \multicolumn{2}{c}{**Strategic Vision (SV)**} \\ vs\_1 & Existence of priority environmental objectives, made aware at the organization level (on a top-down scale), through programs to streamline the use of resources \\ vs\_2 & The existence of a cooperation partnership in the field of sustainable economy with organizations in the public and/or private environment (chambers of commerce, entrepreneurs’ associations, universities, central or local public authorities, etc.) \\ vs\_3 & Existence of a management strategy oriented to reintegration programs of the resources used in the production circuit \\ vs\_4 & Participation in the green procurement procedures organized by the public authorities \\ \hline \multicolumn{2}{c}{**Reglemation (Reglem)**} \\ Reglem\_1 & Funding programs from European and/or national public funds \\ Reglem\_2 & Economic incentives provided for in national legislation, favorable to investments in “green” projects \\ Reglem\_3 & Existence of a legal framework adopted in the field of green procurement \\ \hline \multicolumn{2}{c}{**Competences (Compet)**} \\ \hline \multirow{3}{*}{Compet\_1} & Participation in discussion forums and information exchanges with profile organizations, to transfer knowledge of developments and expertise in the field of green procurement \\  & Training courses for specialists in the field of environmental policy and public procurement, especially in the field of green procurement \\  & Knowledge of specific and/or functional criteria in the field of green procurement that ensures compliance with the legislation in the field \\  & Innovative technologies research to reduce energy consumption, extend product life, and reuse resources \\ \hline \multicolumn{2}{c}{**Integrated operational management (Oper)**} \\ \hline Oper\_1 & Existence of a procurement and strategy department to respond adequately to external requests (business partners, public authorities, etc.) \\ Oper\_2 & Existence of a logistics department, responsible for packing, recycling, resource reuse, low energy consumption, etc. \\  & The existence of an applied research department, which integrates innovative products and/or technologies in the production circuit \\ Oper\_4 & The existence of an integrated data flow, available to the directorates within the organization \\ \hline \multicolumn{2}{c}{**Social responsibility (Resp)**} \\ \hline Resp\_1 & Carrying out campaigns of social involvement, by presenting the benefits of green acquisitions \\ Resp\_2 & CSR and ethics programs at the organization level \\ Resp\_3 & Incentives provided to employees for compliance \\ \hline \multicolumn{2}{c}{**Innovation (Inov)**} \\ \hline Innov\_1 & Holding certifications in the field of organic production (for example, the use of eco-label labels) \\ Innov\_2 & Holding patents/licenses for environmentally friendly technologies \\ \hline \end{tabular}
\end{table} 
Table 1: Description of the independent variables in the model with small sample sizes and complex models. Moreover, many recent studies indicate that the main reason for choosing PLS-SEM methodology is the lack of distributional assumption need [50; 51; 52].