Abstract
A wide sample of countries has been used to contrast the effective influence on the population's schooling duration of some variables usually considered in theoretical models. But we have also found that socio-economic conditions have a special influence because they reduce the chance that people have to access the educational system.
Acknowledgements
The authors are grateful to the comments suggested by Zenón López-Ridruejo and Patricia Gómez Costilla. Any error is solely due to them.
Notes
1 See Battese and Coelli (Citation1988) for more details.