text: Second, our sectoral aggregation scheme for GTAP ensures that all the competing and complimenting sectors 
  for maize are present in the most disaggregated form. For example, for maize, other crops compete for inputs of 
  production and both livestock and households are major users of maize. For regional aggregation, we kept the 
  details for all the main producing, consuming, and trading regions, for maize. 