FindImportExport.lua

function MinMaxCommodity(sys)
  sys = sys or Game.system
  if sys:isa('SystemPath') then
    sys = sys:GetStarSystem()
  end

  local alt = sys:GetCommodityBasePriceAlterations()
  local minPrice = math.huge
  local maxPrice = -math.huge
  local minCargo, maxCargo
  for k,v in pairs(alt) do
    if v < minPrice then
      minPrice = v
      minCargo = k
    end
    if v > maxPrice then
      maxPrice = v
      maxCargo = k
    end
  end

  print('Best import:', maxCargo)
  print('Best export:', minCargo)
  return minCargo, maxCargo
end