Marx’s Analysis of Money: Functions, Circulation, and Profit

Money performs four principal functions in a market economy. It serves as a measure of value, allowing the worth of any commodity to be expressed in a common denominator. It acts as a means of circulation, enabling the exchange of goods and services. It is a store of value, preserving purchasing power over time, and a means of payment, settling debts and loans. A related role is the standard of price, the unit—such as dollars or gold—in which prices are quoted.

Money as a Measure of Value

In Marx’s view, money functions as a universal equivalent that mirrors the labor time embodied in a commodity. The price of a commodity is the content of this measure, while the “money name” (e.g., pounds, dollars) represents that value. Because a commodity cannot express its own value— a banana cannot be valued by another banana—money or another commodity must serve as the denominator. This makes money a “real concealer,” showing value while hiding the underlying production process.

Money as a Means of Circulation

Money mediates the form change of commodities, acting like a metabolic fluid that moves goods through society. Sufficient money must be present for trade; scarcity blocks transactions. Marx describes circulation as an ellipse, a “real contradiction” where value appears to move away from and back to the same point simultaneously. Value does not double; it transfers between parties, creating a moving contradiction.

The exchange formula for a simple market is C‑M‑C (Commodity‑Money‑Commodity). A sale converts a commodity into money; a purchase converts money into a commodity. Sellers become buyers of money, and buyers become sellers of money, producing a “schizophrenia” of roles. Every economic activity forms a circuit that must close, and the circulation of commodities expands both space and time. Geographic distance and seasonal cycles give way to turnover times, making time a calculable factor, though still dependent on many variables. This expansion breaks the identity of things, and when internally dependent elements (money and commodities) become excessively externally independent, crises emerge. Barter, according to Marx, is not true circulation because it lacks the circular, societal character of monetary exchange.

Money as a Store of Value

Because exchange economies are temporal, money must retain value for future purchases. When money remains in circulation, it can absorb inflation; idle money, by contrast, loses purchasing power.

Money as a Means of Payment

Money is the accepted medium for settling credit and loans. Accumulated money functions as a reserve fund, not as wealth. If it stays out of circulation, it depreciates. Capital, therefore, is value actively circulating with the purpose of generating more value, rather than a static stock of wealth.

Critique of Circulation as the Source of Profit

Marx dismisses the notion that profit originates in the sphere of circulation, ridiculing the view of the market as an “Eden of innate human rights” that guarantees freedom, equality, and property. He argues that profit does not arise from the market’s equivalence exchange; instead, profit is linked to production. The C‑M‑C circuit begins with production and ends with consumption, focusing on use values where no surplus can be extracted. By contrast, the M‑C‑M circuit (Money‑Commodity‑Money) seeks to return the original money plus an increment, indicating a different dynamic.

The M‑C‑M Circuit

In the M‑C‑M circuit, money starts the process, is exchanged for a commodity, and then returns as money, ideally with a surplus. The owner’s need for money, not the commodity itself, drives the transaction, reflecting a “transvaluation of values” under capital. The circuit’s purpose is the return of money to its starting point, not merely the satisfaction of needs. The formula M‑C‑M alone does not explain the “mysterious change delta” that appears as profit.