Table 2. 
PPML Gravity Estimates, 1988–2012
(1)(2)(3)(4)(5)(6)
Exporter GDP 0.71*** 0.87***     
 (0.05) (0.04)     
Importer GDP 0.69*** 0.84***     
 (0.05) (0.03)     
Distance −0.75*** −0.80*** −0.88*** −0.76*** −0.75*** −0.81*** 
 (0.01) (0.01) (0.00) (0.00) (0.01) (0.01) 
Common 0.09*** 0.08*** 0.27*** 0.27*** 0.10*** 0.09*** 
language (0.03) (0.03) (0.00) (0.00) (0.03) (0.03) 
Bilateral real −0.10* −0.25*** −0.04*** −0.10*** 0.16*** 0.04*** 
exchange rate (0.06) (0.06) (0.00) (0.00) (0.06) (0.07) 
Constant −5.68*** −9.98*** 15.0*** 15.0*** 17.5*** 18.3*** 
 (1.16) (0.90) (0.00) (0.00) (0.11) (0.12) 
Dependent Consumer Consumer Consumer Consumer Consumer Consumer 
variable goods goods goods goods goods goods 
 excluding  excluding  excluding  
 cars  cars  cars  
Fixed effects Exporter, Exporter, Time-varying Time-varying Exporter, Exporter, 
specification importer, importer, exporter, exporter, importer, importer, 
 time time importer importer time time 
No. of 23,249 23,249 23,249 23,249 23,249 23,249 
observations 
Sample period 1988–2012 1988–2012 1988–2012 1988–2012 1988–2012 1988–2012 
(1)(2)(3)(4)(5)(6)
Exporter GDP 0.71*** 0.87***     
 (0.05) (0.04)     
Importer GDP 0.69*** 0.84***     
 (0.05) (0.03)     
Distance −0.75*** −0.80*** −0.88*** −0.76*** −0.75*** −0.81*** 
 (0.01) (0.01) (0.00) (0.00) (0.01) (0.01) 
Common 0.09*** 0.08*** 0.27*** 0.27*** 0.10*** 0.09*** 
language (0.03) (0.03) (0.00) (0.00) (0.03) (0.03) 
Bilateral real −0.10* −0.25*** −0.04*** −0.10*** 0.16*** 0.04*** 
exchange rate (0.06) (0.06) (0.00) (0.00) (0.06) (0.07) 
Constant −5.68*** −9.98*** 15.0*** 15.0*** 17.5*** 18.3*** 
 (1.16) (0.90) (0.00) (0.00) (0.11) (0.12) 
Dependent Consumer Consumer Consumer Consumer Consumer Consumer 
variable goods goods goods goods goods goods 
 excluding  excluding  excluding  
 cars  cars  cars  
Fixed effects Exporter, Exporter, Time-varying Time-varying Exporter, Exporter, 
specification importer, importer, exporter, exporter, importer, importer, 
 time time importer importer time time 
No. of 23,249 23,249 23,249 23,249 23,249 23,249 
observations 
Sample period 1988–2012 1988–2012 1988–2012 1988–2012 1988–2012 1988–2012 

GDP = gross domestic product, PPML = Poisson pseudo-maximum likelihood.

*** = significant at 1%, ** = significant at 5%, and * = significant at 10% level.

Notes: The table contains PPML estimates of gravity models. Bilateral exports from 31 major exporters to each of the other 30 economies in 1988–2012 are included. Huber-White standard errors are in parentheses.

Source: Author's calculations.

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