Fiat money inflation in France: How it came, what it brought, and how it ended examines the far-reaching consequences of abandoning stable monetary principles during a period of national upheaval. The narrative traces how emergency financial measures intended to resolve fiscal distress instead accelerated economic collapse and social instability. Drawing on official records, debates, and public reactions, the book shows how unchecked paper currency expansion distorted prices, weakened public trust, and intensified political conflict. Early optimism surrounding reform gradually gives way to scarcity, speculation, and unrest as everyday life becomes entangled with policy misjudgment. The work emphasizes recurring ideas of human overconfidence, moral hazard, and the danger of treating money as a political instrument rather than a social contract. Broader reflections on responsibility, governance, and historical repetition give the account relevance beyond its immediate setting. By connecting financial theory with lived consequences, the book presents a cautionary study of how economic experiments can reshape institutions, values, and collective behavior long after their original intent has faded.