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Table 9 Effect of group membership on input costs

From: Can producer groups improve technical efficiency among artisanal shrimpers in Nigeria? A study accounting for observed and unobserved selectivity

  Total variable costsa Fuel costb Labor costb Leader costb
Coeff Coeff Coeff Coeff
MEMBERSHIP  − 14.48**
(7.03)
 − 332.16**
(155.97)
 − 6739.38*
(3660.02)
 − 5196.67**
(2594.33)
Control variables Yes Yes Yes Yes
Location dummies Yes Yes Yes Yes
EXTENSION residual 1.30
(1.46)
7.05
(32.46)
1104.78
(761.68)
1014.66*
(539.90)
CREDIT residual  − 0.40
(1.97)
11.11
(43.78)
 − 537.43
(1027.29)
 − 687.88
(728.17)
Constant  − 5.72*
(3.12)
180.49
(69.25)
1495.24
(1625.09)
647.96
(1151.91)
Number of obs 350 350 350 350
  1. ***p < 0.01, **p < 0.05, *p < 0.1. Control variables used in the model were similar to those specified in Eq. (13). Standard errors are presented in parentheses. aCoefficients are presented in millions while bin thousands and estimations are based on the matched sample. MEMBERSHIP was instrumented using the number of fisher groups at the village level. For full model results, please refer to Tables S2, S3, S4 and S5 in the additional file provided with this study
  2. Source: Authors’ calculation based on survey data