The Graph of Money Flows

Money is a number on a ledger, and the economy is a graph in which that number moves from ledger to ledger.

Individuals, companies, banks, and governments each maintain their own ledgers. Whenever wages are paid, purchases are made, taxes are collected, loans are issued, interest is paid, or investments are made, a number moves from one ledger to another.

Money ultimately serves people, but it does not reside only with them. A company can hold and invest money and continue to exist as its members change. To understand the economy, we must therefore treat the ledgers of companies, banks, and governments—not only those of individuals—as independent nodes.

Money moves continuously across this graph. An individual spends wages received from one company at another. That company pays its employees and suppliers. Its suppliers buy from still other companies, while the remaining money moves as taxes, interest, and dividends.

Not every node retains the same amount. A great deal of money may pass briefly through one node while almost none remains. Another may receive only a small portion of the total flow yet accumulate a great deal.

Revenue is the incoming flow; profit is the portion that remains on the company’s ledger. No matter how much money comes in, little remains if most of it must be paid to suppliers, employees, landlords, and creditors.

A business is a structure that allows part of a recurring flow to remain on its own ledger as the capacity for exchange moves across the graph.

Earning 100 million won does not require collecting one won from 100 million people. A business could collect one million won from 100 people or ten million won from ten companies. What matters is not the number of customers, but how much of which flow can be captured, how often, and at what cost.

Visa does not own all the money being paid. It takes a very small portion as a vast flow passes between consumers and merchants. Its share is small, but the flow is enormous and the transactions repeat.

NVIDIA occupies a critical bottleneck in the money invested in AI. Companies developing AI need computing resources and have had to pass through NVIDIA’s hardware and software to obtain them. NVIDIA did not merely sell semiconductors; it occupied a position in a growing flow of capital that was difficult to bypass.

Google occupies the point where human attention meets corporate advertising budgets. People use Google to find information, and companies pay Google to reach those people. Google creates the connection between the two groups and captures part of the resulting flow.

Finding a place through which a great deal of money moves is not enough. The flow must pass through the business, the cost of capturing it must be low, and alternative routes must be difficult to build.

Simply blocking a flow cannot produce a durable business. If a company does not create more value than it takes, customers will seek another route. The more value a bottleneck captures, the stronger the incentive to bypass it. Google’s development of its own TPUs is one example of bringing compute flows in-house to reduce the cost and dependence associated with external accelerators.

A good business does not merely take from a flow. It expands the flow and captures a part of it. If customers save more money or earn more revenue than they pay, the company’s share becomes sustainable.

The size of a business is ultimately determined by the size of the flow, the share it captures, how often the transaction repeats, and how long the structure endures. A good business takes a high share of a large, recurring flow at low cost for a long time.

Investing means buying ownership in a company that already occupies such a position. The investor must judge which flows of money will grow, who will capture the largest share, and how long that position can be defended.

Business is ultimately a question of where to stand before it is a question of what to sell. The goal is to occupy a point in the graph where a recurring flow passes and part of it continues to remain on one’s own ledger.