《史记·十二本纪·秦始皇本纪》
要吃粮食的很多，估计储存的粮食不够吃的，就向下面的郡县调用，把粮食草料运送到咸阳，运送的人都自带粮食，咸阳三百里以内的百姓不能食用这批粮谷，执法更加严厉苛刻。
当食者多，度不足，下调郡县转输菽粟刍藁，皆令自赍粮食，咸阳三百里内不得食其穀。用法益刻深。
They ate a lot of food; they anticipated their stored food would be insufficient, so they requisitioned food from the counties below, and the food and hay were transported to Xianyang. The people who transported the food took their own provisions, and people living within 300 miles of Xianyang could not eat the grain, which increased hardship and harshness.