Intra-industry trade in  vertically and inferiorly differentiated products Intra-industry trade in  vertically and superiorly  differentiated products
Coefficient (t-Student) Coefficient (t-Student)
TSDt-1 0.190*
( 0.148)
-0.588*
( -0.395)
INV 0.257*
(0.132)
0.287**
(0.111)
DS 0.233
(1.157)
0.291***
(2.011)
FSH 0.627***
(1.08)
-0.387***
(-0.471)
FSV -7.925*
(1.22)
6.087***
(2.45)
TER -4.057**
(-4.389)
-9.11**
(-4.101)
OC 0.046
(0.149)
0.369**
(0.804)
GDP 8.548
(2.33)
5.111
(2.32)
Constant -14.254**
( -2.87)
-34.81***
(-3.74)
Hansen test of validity of
instruments
chi2(198)  =   0.00
p-value =  1.000
chi2(198)  =   0.00
p-value =  1.000
Sargan test of validity of
instruments
chi2(198)  = 152.35
p-value =  0.447
chi2(198)  = 155.11
p-value =  0.391
Arellano-Bond test for AR (1) in first differences    

z =  -2.75
p-value =  0.039

z =  -2.87
p-value =  0.049
Arellano-Bond test for AR (2) in first differences z =   0.64
p-value=  0.417
z =   0.61
p-value=  0.401
(***) Significant at 1%; (**) Significant at 5%; (*) Significant at 10%.
Table 4: Estimation results by the system GMM method, Dependent variable: Intra-industry trade in vertically differentiated products, Number of observations: 200, Number of sectors: 8.