Money has always been more than metal and paper; it is the invisible architecture of modern life. From the moment we wake to the instant we sleep, its presence shapes what we can access, whom we can become and how securely we move through the world.
For centuries, we understood this power through a single, enduring image: money as blood, circulating through the body of the economy, keeping every organ alive and connected. But that image is no longer enough. The digital revolution has not just accelerated the flow of money—it has changed its very nature. We are witnessing a transformation from the old biology of cash to the new reality of a cashless economy, where money moves not as substance, but as information.
Many people once believed money could solve almost everything. No one was able to belittle its value. Its extraordinary ability to solve problems of resource allocation and coordination shapes a huge share of practical life. It buys access to healthcare, education, food security, shelter and legal representation—even time, through delegation or hiring people to do things you cannot or will not do for reasons of capacity or preference.
It is a widely held view that money removes a massive amount of baseline life challenges: bills, basic comfort, access to opportunity. That is why it is often regarded as a kind of magic, offering simple solutions to complex or long-standing problems—resolving material anxiety while freeing significant cognitive and emotional energy. Basic survival needs like hunger, thirst and exposure to the elements are immediately addressed with money. You can pay someone to mow your lawn, fix your car, handle your taxes or clean your house—freeing up mental bandwidth and hours in the day.
There is a common saying that likens money to blood vessels carrying the essential elements of life: circulating what is needed, removing waste, keeping every part of the system connected and alive as one functioning organism. This is not just a folk image—economists have used it since the 18th century, and central banks still speak of liquidity and credit flow in exactly this bloodstream language. Money’s three classic functions give the metaphor its structure: medium of exchange, store of value and unit of account. The monetary unit—birr, dollar, euro—measures wealth in a comparable form across contexts; liquidity expresses how easily an asset converts into that unit without loss.
Yet this circulatory function is changing in the digital world. You may not even have physical touch or eye contact with hard currency when it is transferred—you see only a confirming text. This is the new reality of tightening financial conditions and ensuring the smooth functioning of payment and credit systems without any physical contact with monetary units. It spares no economic unit, including capital, where a far larger stock of wealth circulates and is allocated. Capital markets were already the most digitised, most leveraged and least physically anchored part of the system even before retail payments went fully digital—so the shift simply completes a process capital had already started.
When money existed as notes and coins, the blood-vessel metaphor had a literal anchor: something tangible moved from hand to hand, vault to vault. What the digital world describes is the completion of that process—money reduced almost entirely to symbolic confirmation: a text message, a ledger entry, a database update, with no physical instantiation most of the time. Things are changing to narrow money’s function mainly to a unit of measurement of wealth and a fluid whose movement is controlled by owners or central banks—regulating and measuring the flow of credit and capital so the system avoids clotting or bleeding out.
Large pools of wealth—pension funds, sovereign wealth funds, institutional capital—are essentially pure information now, reallocated by algorithmic and human decision in fractions of a second across global markets. This makes the digital transaction closer to an electrical or nervous-system signal than a circulatory one: entitlement transmitted and confirmed rather than physically delivered. It is arguably the better biological analogy for modern finance—a system less about substances feeding the body and more about signals coordinating it, informing wherever needed, instantly.
Come what may, here is the key shift: money’s store-of-value function is preserved, but its circulatory role—how it moves—is now largely digital, invisible and text-mediated. What you see are notifications, SMS alerts, app confirmations and account statements: certificates that a transfer occurred, not tokens that moved.
This changes the speed and reach of monetary policy transmission enormously. Physical money forces central bank action through slow, tangible channels—banks physically holding reserves, credit contracting through individual loan officers’ decisions. Digital money lets a rate decision or a liquidity signal propagate through the entire system within seconds—interbank lending, capital markets and currency markets adjusting nearly simultaneously. This is part of why financial contagion moves so much faster than in earlier eras: flash crashes and sudden liquidity crunches, driven by information alone, are modern phenomena unimaginable when capital required physical settlement.
This is a natural bridge to AI and allocation. Because money’s circulatory function is now almost entirely informational, the case for AI improving allocation gets stronger on mechanical grounds alone—the system already runs on real-time digital signals, ready-made for AI-driven optimisation to refine further. Physical settlement is becoming obsolete; the new requirement is digital infrastructure, not printed notes.
This is the forward, fast move toward a cashless economy: mobile money, online transfers, card payments, contactless transactions—value moving without contact with a single note. Credit allocation—loan approvals, disbursements, repayments, risk assessment—is now logged and transmitted electronically end to end.
Capital now flows through digital market rails, depositories and cross-border payment systems, with no need for physical notes at any point. Policymakers must now manage this digital bloodstream directly, without printing money, focused on keeping the payment and credit system running smoothly.
The digital world spares no one on the line. Households, firms, banks, investors and governments are all required to operate within this digitally mediated network. The question now is whether you go along, or you get left behind until you board the vehicle with an understanding of every layer of the system.
Money has long been celebrated as a near-magical tool, solving survival needs and freeing cognitive energy by outsourcing what we cannot or will not do ourselves for different reasons. It used to serve us as economic blood all the while performing its three classic roles and coordinating a vast, decentralised system of producers, consumers, savers, borrowers, labour and capital.
Thus the old metaphor of money as the economy’s bloodstream captured this well when cash and coins physically moved from hand to hand and vault to vault. Yet the digital transformation of finance has quietly rewritten the biology of the system to create a cashless society. In this new reality, the nervous-system metaphor fits better than the circulatory one.
In a cashless economy, money’s biology is shifting: from physical cash flowing hand to hand, it is now a nervous-system-like motion where instant, invisible signals—ledger entries, app confirmations and algorithmic trades—coordinate activity.
The shift from cash to digital is not merely a change in payment technology; it is a fundamental rewriting of money’s biology. Where we once felt money move—hand to hand, vault to vault—we now see only notifications, confirmations and algorithmic trades. The circulatory metaphor that served economists and central bankers for centuries has given way to a nervous-system reality.
This new order brings extraordinary speed and efficiency, but also new vulnerabilities—flash crashes, digital exclusion and the concentration of power in those who control the infrastructure. The challenge ahead requires not resisting this transformation, but governing it wisely: to ensure that the digital bloodstream remains inclusive, stable and accountable. Money will always be magic—but in the cashless age, that magic runs on code, not on notes or coin. That is the biological shift in a cashless economy.
But the most important thing in life is not money, but the things money can’t buy. For me, these are peace and love.
