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Table S1. Robustness checks of model results. Models 9 and 10 are negative binomial count models using a panel of developing countries only. Models 11 and 12 use an alternative corruption measure, Transparency International's Corruption Perceptions Index. Intercept and country fixed effects not reported to save space.

Table S2. Robustness checks of model results. Models 13 and 14 omit the lagged dependent variable. Models 15 and 16 include year fixed effects. Intercept, country fixed effects, and year fixed effects (for Models 15 and 16) not reported to save space.

Table S3. Robustness checks of model results. Models 17 and 18 include spatial lags based on ISO 9001 adoption in trade and investment partner countries. Models 19 and 20 include spatial lags based on GDP per capita in partner countries. Models 21 and 22 include an additional control variable for the logged number of international environmental treaties a country has signed or ratified. Intercept and country fixed effects not reported to save space.

Table S4. List of countries included in the analysis.

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