	(1)	(2)
	est5	est6
VARIABLES	s_ijt	s_ijt
		
dsps	-0.013***	-0.013***
	(0.002)	(0.002)
ltariff	-0.001*	-0.001*
	(0.001)	(0.000)
rta	0.003	0.003
	(0.003)	(0.003)
Constant	0.076***	0.066***
	(0.002)	(0.001)
		
Observations	76,219	87,120
R-squared	0.930	0.927
Robust standard errors in parentheses		
*** p<0.01, ** p<0.05, * p<0.1		
