Saving goes on in a natural economy both by accumulation of indirect agents and by elaboration so as to improve their quality.[1] It goes on to-day by the replacement of perishable by durative agents, as in replacing a wooden house by one of stone or concrete, and by producing wealth without consuming it, as in increasing the number of cattle on one's farm. But saving has come to be increasingly made in the form of money (or of monetary funds), and in this chapter we shall consider some of the ways in which this can now be done. § 2. #Economic limit of saving#. There is an economic limit to saving, as judged from the standpoint of each individual.[2] The ultimate purpose of every act of saving is the provision of future incomes, either as total sums to be used later or as new (net) incomes to be received at successive periods. The economic limit of saving in each case is dependent upon the person's present needs in relation to present income and conditions, as compared with the prospect of his future needs in relation to his future income and conditions. Each free economic subject must form a judgment and make his choice as best he can and in the light of experience. There is no absolute and infallible standard of judgment that can be applied by outsiders to each case. Yet there is occasion to deplore the improvidence that is fostered and that prevails, especially among those receiving their incomes in the form of wage or salary. Considered with reference to the possible maximum of welfare of the individuals themselves, the apportionment of their incomes in time is frequently woful. It is uneconomic for families of small income to save through buying less food than is needed to keep them in health; but it is likewise uneconomic to spend the income, when work is plentiful and wages good, for expensive foods having little nutriment and then, for lack of savings, to go badly underfed when work is slack and wages are small. There is for each class of circumstances a golden mean of saving. The saving habit may develop to irrational excess and become miserliness, but this happens rarely compared with the many cases where men in the period of their largest earnings spend up to the limit on a gay life and make no provision for any of the mischances of life--business reverses, loss of employment, accidents, temporary sickness, permanent invalidity, or unprovided old age. Despite the development of late of new agencies and opportunities for saving there is need of doing more toward popular education in thrift.[3]