[1] Univ Kent, Sch Econ, Canterbury CT2 7NP, Kent, England
[2] Nottingham Trent Univ, Nottingham Business Sch, Nottingham NG1 4BU, England
[3] Natl Bur Stat China, Dept Rural Social & Econ Survey, Beijing 100826, Peoples R China
[4] Natl Bur Stat China, Dept Comprehens Stat, Beijing 100826, Peoples R China