The History of Money

In the summer of 1942, deep inside Sachsenhausen concentration camp, 142 Jewish prisoners were assembled for a secret operation. Their task: forge £132,610,945 in Bank of England notes. The mastermind behind this industrial-scale counterfeiting was Adolf Hitler, who had witnessed firsthand the destructive power of money during Germany's Weimar hyperinflation. His plan was audacious—drop millions of fake pounds from the sky over Britain, watch citizens pocket the counterfeit cash, and trigger runaway inflation that would cripple the British war effort.

Hitler understood something that most people never grasp. Money is not a neutral tool. It is a weapon.

Half a world away and two decades earlier, Vladimir Lenin had reached the same conclusion. In a 1919 interview, Lenin stated plainly that the simplest way to destroy a capitalist society was to "debauch its currency." Unlike Hitler, who needed to forge another nation's money, Lenin had access to Russia's official mint. He simply flooded the country with banknotes, deliberately weakening the ruble until the old economic order collapsed under its own weight.

These two men, architects of the twentieth century's most destructive ideologies, recognized money's true nature. They saw it not as economists do—a medium of exchange, a store of value, a unit of account—but as a social technology with the power to structure or destabilize entire civilizations.

David McWilliams, a former monetary economist at the Central Bank of Ireland, opens his book *The History of Money* with these dramatic episodes to make a fundamental point. His profession, he argues, has a blind spot. Economists understand the plumbing—how interest rates work, how money supply affects inflation, how central banks operate. But they miss the deeper story. They fail to grasp money's psychological and social impact, the way it shapes human behavior, the emotional weight it carries.

Money, McWilliams argues, is an abstraction that runs on collective belief. Its power is co-created by the human imagination. And over the past five thousand years, this invention has fundamentally reshaped who we are as a species.

Here is where McWilliams introduces his central thesis, and it's worth pausing on because it provides the framework for everything that follows. Anthropologists describe early humans as a "pyrophyte" species—a species shaped by fire. For over 400,000 years, fire dominated human development. It cooked our food, cleared our land, created social centers where we gathered. Fire literally made us who we are.

McWilliams proposes that humanity has undergone a second, equally profound transformation. Over the last five thousand years, we have gradually become a "plutophyte" species—a species shaped by money. Just as fire reshaped our ancestors' biology and social structures, money has reshaped our psychology, our institutions, and our civilization.

This is not a metaphor. McWilliams means it literally. Money, like language, is a crowd phenomenon that becomes more valuable as more people use it. It has co-evolved with humanity, and we with it. We shaped money, but money also shaped us.

Think about what that means. The way we think about time—discounting the future, planning for retirement, calculating interest—is shaped by monetary concepts. The way we organize society—markets, corporations, governments—depends on monetary systems. The way we value ourselves and others—net worth, income, credit scores—is mediated by money. We are, in a very real sense, a plutophyte species.

The book traces this evolution from its ancient origins to the present day. McWilliams takes us from prehistoric Africa, where the Ishango Bone—a tally stick from around 18,000 BCE—suggests the earliest forms of counting and accounting. He moves through the agricultural revolution, where grain became the first form of money, enabling the management of surpluses, taxation, and complex societies. He follows the invention of writing in Mesopotamia, which emerged specifically to record monetary transactions—making money humanity's first written subject.

Then comes the Lydian invention of coinage around 700 BCE, which transformed money from a system of contracts into a portable, physical form. This innovation, McWilliams argues, enabled bottom-up market economies and shifted power from kings to merchants. In ancient Greece, the widespread adoption of silver coins correlated with an intellectual shift from myth-based thinking to logic-based reasoning—a transition from mythos to logos that produced democracy, philosophy, and the scientific method.

Rome's key innovation was credit. The empire built an extensive financial system on conquest and taxation, creating the world's first shareholder class. But this system also introduced systemic fragility. When confidence cracked, the empire experienced the first recorded credit crisis in 33 CE. Centuries of currency debasement led to hyperinflation that contributed to Rome's decline.

The medieval period saw money nearly disappear from northwestern Europe, replaced by a stagnant feudal barter economy. Then, around 1000 CE, a combination of physical technology—the heavy metal plow—and social technology—reintroduced coinage from new silver mines—sparked an economic revival. Fibonacci's introduction of Hindu-Arabic numerals and the concept of zero revolutionized European commerce, enabling complex calculations that had been impossible with Roman numerals.

Florence's gold florin became Europe's reserve currency. Florentine bankers pioneered letters of credit, bills of exchange, and fractional-reserve banking—creating money "out of thin air" and shifting power from the vertical hierarchy of Church and Empire to the horizontal networks of merchants. This financial sophistication fueled the Renaissance.

Gutenberg's printing press, financed by credit, lowered the cost of information and enabled the Protestant Reformation. Martin Luther's ideas spread rapidly through printed pamphlets, challenging the Church's financial practices and its monopoly on salvation. The era of European expansion began, extracting wealth from colonized cultures while monetary systems began to move beyond gold and silver.

The Dutch Republic created the first major public company and sophisticated financial instruments, leading to the first major speculative bubble—Tulipmania. John Law's Mississippi Scheme in France attempted to introduce fiat paper money, creating a massive speculative bubble that collapsed and discredited financial innovation in France for decades.

Alexander Hamilton learned from these failures. He established the US dollar, pegged it to the Spanish silver dollar, assumed state debts, and founded the First Bank of the United States. This financial architecture fueled America's rapid nineteenth-century growth, transforming bankrupt states into a unified economic powerhouse.

But progress has a dark side. The late nineteenth-century bicycle boom created global demand for rubber, linking European consumers to brutal extraction in the Belgian Congo. The public company structure distanced investors from the atrocities it financed, transforming "blood, shit, and death" into a clean balance sheet. Roger Casement's investigation exposed the horror, forcing a confrontation between consumer products and their brutal supply chains.

The twentieth century saw the shift to fiat money—currency backed only by government promise rather than gold. This created a more flexible system but also new risks. Commercial banks, not central banks, create most money as credit. The 2008 financial crisis and the policy response—quantitative easing—exacerbated wealth inequality and fueled populism.

Today, we face a battle between private money—cryptocurrencies like Bitcoin—and public, state-issued money. McWilliams argues that crypto is a speculative asset, not a functional currency. In contrast, Kenya's M-Pesa—a mobile phone-based money system that solved the real problem of expensive and risky remittances—represents genuine, bottom-up monetary evolution.

This is the story McWilliams tells. It spans five thousand years, from the Ishango Bone to Bitcoin. It connects ancient Sumerian grain accounting to modern quantitative easing. It shows how each monetary innovation released human energy while introducing new risks.

But the opening scenes of Hitler's counterfeiting plot and Lenin's currency destruction raise a fundamental question that echoes throughout the book: If money is so powerful that it can be weaponized to destroy nations, what does that mean for how we understand its role in our lives? And if we have become a plutophyte species—shaped by money in ways we barely recognize—what does that transformation mean for who we are and where we are heading?