https://orcid.org/0000-0002-5151-0452
Figures & data
Figure 1. (a) China’s trade policy uncertainty and trade respondent cases. (b) China’s trade policy uncertainty and export product quality.
Figure 2. Quality of export products of different social capital cities in 2010.
Figure 3. Visual inspections of hypothetical parallel trends.
Table 1. The meaning table of key variables.
Table 2. Variables measurements and data sources.
Table 3. The effect of the uncertain decline in trade policy on the quality of export products.
Table 4. Test of the regulatory role of social capital.
Table 5. The results of the test of the mechanism of social capital action.
Figure 4. Parallel trend graphs.
Table 6. Parallel trend test.
Figure 5. Cyclic placebo test.
Table 7. PSM-DID inspection.
Figure 6. The coefficient line chart after deleting the sub-provincial cities in turn.
Table 8. Impact of the global financial crisis.
Table A1. Descriptive statistics.
Table A2. Two-sided tailings and expected effect testing.
Data availability statement
The study data will be available on request.