If farmers become much better at growing food while teachers become little better at teaching kids, the cost of food will tend to fall relative to the cost of education. Moreover, the proportion of the population engaged in farming will tend to fall, since fewer farmers are needed to feed the entire country.
服务成本和商品成本的比较其实取决于生产力。如果农民的食品生产能力大幅提高而教师的教育水平只有轻微上升，那么食物成本相对于教育成本来说就会下降。此外参与农业生产的人口也会趋向下降，因为满足全国食品需求所要求的农民数量更少了。