100% Money by Irving Fisher, published in 1935, presents a proposal for a banking system where all demand deposits are backed by 100% reserves. Fisher argues that this system would eliminate inflation and deflation, stabilize the economy, and prevent financial crises. He critiques the existing fractional reserve system, which allows banks to create money through lending, and suggests that separating money creation from banking would lead to greater economic stability. The book outlines how a 100% reserve system could reduce national debt, prevent economic depressions, and make banking safer. Fisher’s ideas were influential in monetary economics and have been revisited in discussions about financial reform.