Table 9.

Quantile-on-quantile regression analysis

	Lower quantile			Median quantile			Upper quantile
	Q1	Q2	Q3	Q4	Q5	Q6	Q7	Q9	Q9
lnENVTAX	− 0.059***	− 0.047***	− 0.044***	− 0.040***	− 0.027***	− 0.031***	− 0.035***	− 0.029***	− 0.024**
	(− 5.27)	(− 4.42)	(− 5.53)	(− 4.65)	− 3.45	− 3.81	− 6.18	− 3.8	− 2.53
lnPOP	0.002**	0.003***	0.004***	0.005***	0.005***	0.005***	0.005***	0.003***	0.003***
	(− 2.13)	(− 4.00)	(− 6.24)	(− 6.93)	(− 8.06)	(− 7.76)	(− 10.72)	(− 5.24)	(− 3.79)
lnUR	0.012***	0.012***	0.012***	0.013***	0.013***	0.013***	0.014***	0.014***	− 0.014***
	(− 13.77)	(− 14.92)	(− 20.88)	(− 20.40)	(− 21.88)	(− 22.05)	(− 31.96)	(− 23.78)	(− 19.27)
lnREN	− 0.194***	− 0.208***	− 0.193***	− 0.174***	− 0.170***	− 0.179***	− 0.171***	− 0.134***	− 0.098***
	(− 5.88)	(− 6.66)	(− 8.28)	(− 6.79)	(− 7.26)	(− 7.56)	(− 10.18)	(− 6.01)	(− 3.48)
lnACT	− 0.109***	− 0.094***	− 0.086***	− 0.060***	− 0.085***	− 0.074***	− 0.062***	− 0.099***	0.099***
	(− 4.10)	(− 3.77)	(− 4.59)	(− 2.90)	(− 4.50)	(− 3.88)	(− 4.61)	(− 5.54)	(− 4.36)
Constant	1.381***	1.528***	1.602***	1.750***	1.714***	1.771***	1.822***	1.663***	1.670***
	(− 9.87)	(− 11.55)	(− 16.22)	(− 16.10)	(− 17.29)	(− 17.61)	(− 25.50)	(− 17.64)	(− 13.92)

^***, **, and * denote the significance at 1%, 5%, and 10% level, respectively