How did Stocks Get So High?

In an economy which shows healthy, sustained growth, voluntary savings flow into the productive structure by two routes: either through the self-financing of companies, or through the stock market. Nevertheless the arrival of savings via the stock market is slow and gradual and does not involve stock market booms or euphoria (p. 461)..

Only when the banking sector initiates a policy of credit expansion unbacked by a prior increase in voluntary saving do stock market indexes show dramatic and sustained overall growth. In fact newly-created money in the form of bank loans reaches the stock market at once, starting a purely speculative upward trend in market prices which generally affects most securities to some extent. Prices may continue to mount as long as credit expansion is maintained at an accelerated rate. Credit expansion not only causes a sharp, artificial relative drop in interest rates, along with the upward movement in market prices which inevitably follows. It also allows securities with continuously rising prices to be used as collateral for new loan requests in a vicious circle which feeds on continual, speculative stock market booms, and which does not come to an end as long as credit expansion lasts. . . .Therefore (and this is perhaps one of the most important conclusions we can reach at this point) uninterrupted stock market growth never indicates favorable economic conditions. Quite the contrary: all such growth provides the most unmistakable sign of credit expansion unbacked by real savings, expansion which feeds an artificial boom that will invariably culminate in a severe stock market crisis (pp. 461-62).