在熟悉的运输问题中，我们考虑几个工厂的供应和几个市场的需求的商品，我们也给出从工厂运输商品到市场的单位花费。这其中的经济学问题是：怎样安排运输使得我们的总运输成本最小？(In the familiar transportation problem, we consider the supply of several factories and the demand of several markets. We also give the unit cost of transporting goo