Furthermore, the spatial spillovers (indirect effects) of SM are significant in all periods and show an increasing trend because the coefficients are 0.137 from 2006 to 2010 and 0.629 from 2016 to 2020.
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Furthermore, the spatial spillovers (indirect effects) of SM are significant in all periods and show an increasing trend because the coefficients are 0.137 from 2006 to 2010 and 0.629 from 2016 to 2020.