In each and all of these cases it is to the interest of the individual to place new "savings" in new forms of capital in branches of industry where sufficient capital already exists to assist in supplying the current demand for consumptive goods. So far is it from being true that the self-interest of individuals provides an economic check upon over-supply, that it is possible that at each of the points of production, A, B, C, D, E, and in all or the majority of industries at the same time, there should be an excess of forms of capital as compared with that which would suffice for the output, F. The automatic growth of bubble companies and every species of rash or fraudulent investment at times of depressed trade is proof that every legitimate occupation for capital is closed, and that the current rate of saving is beyond that which is industrially sound and requisite. These bubble companies are simply tumours upon the industrial body attesting the sluggish and unwholesome circulation; they are the morbid endeavours of "saving" which is socially unnecessary, and ought never to have taken place, to find investments. When one of these "bubble" companies collapses it is tacitly assumed by unthinking people that those who invested their money in it were foolish persons who might have sought and found some better investment. Yet a little investigation would have shown that at the time this company arose no opportunity of safe remunerative investment open to the outside public existed, every sound form of business being already fully supplied with capital.