Now, prospective yield wholly depends on the expectation of future effective demand in relation to future conditions of supply.

现在，预期收益率完全取决于与未来供应条件相关的未来有效需求的预期。

The aggregate supply function, however, which depends in the main on the physical conditions of supply, involves few considerations which are not already familiar.

然而，总供给函数主要取决于供给的物理条件， 涉及一些不为人所知的考虑因素。