It can be shown that, given the linear demand and constant marginal cost, the function q 1 ″ ( q 2 ) {\displaystyle q_{1}''(q_{2})} is also linear.
可以证明，考虑到线性的需求和不变的边际成本，函数 q 1 ″ ( q 2 ) {\displaystyle q_{1}''(q_{2})} 也是线性的。