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The article discusses the concentration of purchasing power as a cause of business depressions. The exchange of goods for money or rights to money makes possible a situation in which a predominating proportion of people wish to wait before consuming. The logic of oversaving does not necessarily carry with it the conclusion that purchasing power is lacking, but does explain that purchasing power is not automatically called into use to absorb direct goods. To comprehend the relation of saving to depression it is essential to hold in mind the relation of saving to investment. When there is an exercise of the purchasing power there is a use of commercial bank mechanism. The credit volume varies from time to time. In an expansion of credit volume there is put in use more units of purchasing medium; the holders of these units bid against each other, and as a result of this competitive bidding, some prices rise. The term "saving" is not very expressive of what goes on under a commercial bank system.