HIGHLIGHTS
SUMMARY
The promotion effect of GS on GI is continuously weakened as the intensity of CG input increases, i.e., there is an optimal promotion interval of GS on GI under different CG input levels. (1) CG show an inverted U-shaped threshold effect on GI, i.e., there is a weak correlation interval (CG=0.645), a promotion interval (0.645 and amp;lt; CG=0.758), and a crowding-out interval Charitable giving, government green subsidies and green innovation (0.758 and amp;lt; CG) for CG on GI, respectively. (2) With the . . .
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