One might expect that these regions would divide into two groups, those free of
highly-infectious poultry diseases and those that are not free of disease, with trade
occurring within each group. However, this is not the case. The major importers of
poultry products, China, Japan, and Russia, accept imports from all exporting regions in
the model. The two major exporters, the US and Brazil, do not accept imports from each
other and also ban imports from China, based on recurrent outbreaks of Newcastle
Disease. The EU also bans imports from the US and from China. The...