For the short-period supply price is the sum of the marginal factor cost and the marginal user cost.

对于短期供应价格是边际要素成本和边际用户成本之和。

Now in the modern theory of value it has been a usual practice to equate the short-period supply price to the marginal factor cost alone.

现在，在现代价值理论中，通常的做法是将短期供应价格单独等同于边际要素成本。