Can Highway Networks Promote Productivity? Evidence from China

Table 2

Estimating parameter using the impedance function.

Year	Estimated value of	Year	Estimated value of
2000	0.014	2007	0.014
2001	0.012	2008	0.013
2002	0.012	2009	0.014
2003	0.014	2010	0.029
2004	0.013	2011	0.033
2005	0.015	2012	0.044
2006	0.014	2013	0.044