The Role of the United States in the Relation between Iran and China as Two Key Members of the Asian Global Supply Chain

Table 2

Augmented Dicky–Fuller unit root test.

Variables	The t-student				Trend and intercept	Difference level
	Augmented Dicky–Fuller	1%	5%	10%
GDPCHN	−6.31	−4.23	−3.54	−3.20	Trend and intercept	2
LEXPIRN	−2.93	−2.63	−1.95	−1.61	None	1
LIMPIRN	−4.76	−4.24	−3.54	−3.20	Trend and intercept	1
LGDPIRN	−6.83	−4.22	−3.53	−3.20	Trend and intercept	1
LGDPCHN	−4.74	−4.22	−3.53	−3.20	Trend and intercept	1

Source: estimations based on the data extracted from the World Development Indicators (2020).