a College of Economics and Management, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China Department of Economics, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand c Department of Economics, University of Waikato, Private Bag 3105, Hamilton, New Zealand d College of Agronomy, Henan Agricultural University, 95 Wenhua Road, Zhengzhou 450002, China b A R T I C L E I N F O A B S T R A C T Article history: Received 18 May 2009 Accepted 13 July 2009 This…
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