Shipments) (0.056) (0.061) N 55770 40843 a Excludes the first observation for a facility if it occurs after 1987. b Only includes observations from 2007. All models only include facility-years with releases>20 pounds. All models include industry and year fixed effects. Standard errors, clustered by industry, are *p<.05 **p<.01 †p<.10 reported in parentheses. Table 8 The impact of concentration on pollution reduction activities Ln(Pollution Ln(Pollution Ln(Pollution Ln(Pollution Reduction) Reduction) Reduction) Reduction) HHI -0.006 -0.013 (0.008) (0.008) CR4 -0.007* (0.003) CR8 -0.006* (0.002) Ln(Value 0.153** 0.123* 0.119* 0.119* of (0.053) (0.054) (0.053) (0.053) Shipments) Ln(facility 0.191** 0.192** 0.192** releases) (0.016) (0.016) (0.016) N 46316 42521 42003 42115 All models only include facility-years with pollution reduction>20 pounds. All models include industry and year fixed effects. Standard errors, clustered by industry, are reported in parentheses. *p<.05 **p<.01 †p<.10 Table 9 The impact of concentration on aggregate industry emissions Ln(Aggregate Ln(Aggregate Industry Industry Releases) Releases) HHI 0.002 0.015* (0.007) (0.006) Ln(Value of 0.072 0.071 Shipments) (0.054) (0.041) Ln(Number 1.163** of (0.048) Facilities) N 77656 77656
Shipments) (0.056) (0.061) N 55770 40843 a Excludes the first observation for a facility if it occurs after 1987. b Only includes observations from 2007. All models only include facility-years with releases>20 pounds. All models include industry and year fixed effects. Standard errors, clustered by industry, are reported in parentheses. †p<.10 *p<.05 **p<.01 Table 8 The impact of concentration on pollution reduction activities Ln(Pollution Reduction) Ln(Pollution Reduction) Ln(Pollution Reduction) Ln(Pollution Reduction) HHI -0.006 (0.008) -0.013 (0.008) CR4 -0.007* (0.003) CR8 -0.006* (0.002) Ln(Value of Shipments) 0.153** (0.053) 0.123* (0.054) 0.119* (0.053) 0.119* (0.053) Ln(facility releases) 0.191** (0.016) 0.192** (0.016) 0.192** (0.016) N 46316 42521 42003 42115 All models only include facility-years with pollution reduction>20 pounds. All models include industry and year fixed effects. Standard errors, clustered by industry, are reported in parentheses. †p<.10 *p<.05 **p<.01 Table 9 The impact of concentration on aggregate industry emissions Ln(Aggregate Industry Releases) Ln(Aggregate Industry Releases) HHI 0.002 (0.007) 0.015* (0.006) Ln(Value of Shipments) 0.072 (0.054) 0.071 (0.041) Ln(Number of Facilities) 1.163** (0.048) N 77656 77656
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