dataproc.gtap.Rdprocesses gtap raw data to get margin and tariff data for tradecast
dataproc.gtap(
  gtapdatadir = paste0(system.file("extdata", package = "tradecast", mustWork = T),
    "/gtap/")
)path to gtap data dir
Returns a dataframe (basedata.pricelink.margin.mtax) including margin and tariff, and also nonland cost share.