@article{Haq:126903,
      recid = {126903},
      author = {Haq, Zahoor Ul and Meilke, Karl D. and Orden, David},
      title = {Do Preferential Trade Agreements Increase Members’  Agri-food Trade?},
      address = {2012},
      number = {1007-2016-79598},
      pages = {34},
      year = {2012},
      abstract = {This study estimates the effect of a diverse group of 30  PTAs on members’ trade of 26 agri-food products categorized  into eight commodity sectors for 1990, 1995, 2000 and 2000  using disaggregated trade data for 40 countries and the  Heckman selection model. Results show that whether reported  zero trade-flows are considered actual or potential affects  the size of the estimated PTA impacts. However,  irrespective of the true nature of the zero trade-flows,  the effects of PTAs are found positive and statistically  significant. OLS estimates fall between the  Heckman-model-derived conditional and unconditional effects  of PTAs.},
      url = {http://ageconsearch.umn.edu/record/126903},
      doi = {https://doi.org/10.22004/ag.econ.126903},
}