Gortland has long been narrowly self-sufficient in both grain and meat  However, as per capita income in Gortland has risen toward the world average, per capita consumption of meat has also risen toward the world average, and it takes several pounds of grain to produce one pound of meat
Ttherefore, since per capita income continues to rise, whereas domestic grain production will not increase, Gortland will soon have to import either grain or meat or both
The per capita consumption of meat in Gortland is increasing at roughly the same rate across all income levels.