Other People's Money and How the Bankers Use It is a collection of essays written by Louis Brandeis published as a book in 1914. The book attacked the use of investment funds to promote the consolidation of various industries under the control of a small number of corporations, which Brandeis alleged were working in concert to prevent competition. Brandeis harshly criticized investment bankers who controlled large amounts of money deposited in their banks by middle-class people.

The heads of these banks, Brandeis pointed out, routinely sat on the boards of railroad companies and large industrial manufacturers of various products, and routinely directed the resources of their banks to promote the interests of their own companies. These companies, in turn, sought to maintain control of their industries by crushing small businesses and stamping out innovators who developed better products to compete against them.

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