有些是有下界的，现在我们可能会期望一个临界值或影子价格。
Some of them are lower bounded, and you probably expect a marginal value or shadow price by now.
讨论了线性规划模型中，消耗系数矩阵a中某个基变量或某个约束方程的系数向量变化以及增减约束方程时，对最优基、最优解、目标函数值和影子价格的影响。
The paper discuss the effect exerting on objective function, optimum solution and shadow price in LP when consumption coefficient matrix a change and a inequality constraint is increased or decreased.
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