Nevertheless it will clear our minds to consider them separately under two broad heads which we shall call the subjective factors and the objective factors.

然而，我们可以清楚地在我们称之为主观因素和客观因素的两大类下分别考虑它们。

But, in general, we shall in what follows take the subjective factors as given; and we shall assume that the propensity to consume depends only on changes in the objective factors.

但是，一般来说，我们将在下文中将主观因素视为给定；我们假设消费倾向只取决于客观因素的变化。

In an historical enquiry or in comparing one social system with another of a different type, it is necessary to take account of the manner in which changes in the subjective factors may affect the propensity to consume.

在进行历史研究或将一种社会制度与另一种不同类型的社会制度进行比较时，有必要考虑主观因素的变化可能影响消费倾向的方式。