2. _Another group of theories explains the crises as being due to money, either too much or too little._ The unregulated issue of bank-notes has been assigned as the cause of crises, especially under the circumstances accompanying such crises as those of 1837 and 1857 in America, when bank-note issues chanced to be the agency most marked in the undue and unsound expansion of credit. The issue of government paper money, leading to inflation and speculation, is assigned as a cause leading up to such a crisis as that of 1873, following our Civil War. The reverse view is taken by the advocates of a cheap and plentiful money. They say that these crises were caused, not by the expansion, but by the reduction of bank-notes; for example, not by the inflation of prices through the issue of greenbacks in 1862 to 1865, but by the contraction of the currency from 1866 to 1873. [Sidenote: Their inadequacy] There is only a fragment of truth in these various views. It is always lack of money at the moment of the crisis that causes any particular failure, and in that sense it is always lack of money that causes a crisis. But the question is, whether in any reasonable sense it can be said that it was lack of a circulating medium before the crisis that brought it on. There is no support for this view, except in the rare case when the money standard is undergoing a rapid change, as in the United States from 1866 to 1873, and the statement then needs much modification and explanation. The money theories of crises are nearer to the truth than are the over-production type, for the crisis is always connected with money and prices. But it cannot be said that the absolute amount of money in circulation in the period preceding crises gives occasion to them. In a few instances a rapid change in the amount has had an important effect, but this fact does not explain crises in general. Lack of confidence is said to be a cause of crises. This is a truism, but the lack of confidence is not without reason and cause. Over-confidence in the period of expanding prices is succeeded by extreme depression when many false hopes are shattered. [Sidenote: Capitalization theory of crises]