Human Fungibility

The Physics of Replaceability

Fungibility is when an asset or commodity can be exchanged for others of the same type and value. Individual units become functionally indistinguishable, interchangeable, and not unique. Common examples include money, stocks, and raw materials. We don’t care about a particular loaf of bread, only the existence of a loaf of bread. Fungibility itself — not malice, not even intelligence — is the structural condition that breaks reciprocal exchange among humans. It’s fundamentally a scale problem. If humans are mutually interchangeable, reciprocity breaks. When the counterparty is replaceable, defection is cheap. You don’t need this person’s future cooperation because there’s an endless supply of others who don’t yet know how you operate or they need what you provide enough for it not to matter. The reputational enforcement that kept small-scale human exchanges more honest, depended entirely on the fact that you’d encounter those same people, and your memory of their behavior, indefinitely. Fungibility dissolves that. The cheater can just move to the next village, the next customer, the next match in the queue, the next follower cohort. And it’s not only “bad actors” who exploit this. The incentive structure selects for parasitic extraction. Parasitism is the default — the lowest energy channel. Systems that treat people as interchangeable units, evolve toward extractive equilibria even when no one involved intended that, because that is how the system is structured to process energy. The medium is the message. The role overtakes the person. It’s a defect-defect equilibrium.

This is why things that still feel reciprocal tend to involve some form of non-fungibility: this particular person, this particular place, this particular commitment that can’t be swapped out for a better-optimized alternative. Friction, switching costs, and path dependence are what make honesty enforceable. The project of modernity has been largely about increasing fungibility — liquidity, mobility, optionality, efficiency, and freedom from constraint. And these are real goods. But they come with an inherent cost: every increase in fungibility is a weakening of the conditions under which reciprocity — and the suite of behaviors we identify as human dignity — holds. It’s impossible to have anything else be the outcome. Thermodynamics forbids it. It’s not that no individual relationship can be reciprocal, but that at scale, the system overall trends toward extraction — the stable evolutionary attractor is parasitic extraction until resource exhaustion. This reality isn’t some policy failure, moral failure, or design flaw that could be corrected. It’s the equilibrium that the structure produces, it’s no different than the way a star burns through its substrate until it exhausts its nuclear fuel. You can carve out local exceptions: relationships with enough mutual embeddedness, communities small enough to maintain memory, contexts where exit is costly enough to force long-term thinking. But these exist as eddies against the current. We can slow the river down, but never change that water flows downhill. As any of these communities succeeds and grows the same mechanics form. The main flow is toward liquidity, optionality, scale, and replaceability and therefore toward the conditions that make parasitic extraction the stable strategy whenever conditions permit. What’s striking is that we’ve built an entire civilization around the pursuit of those conditions. The freedom to leave, the freedom to choose, the access to endless alternatives — these are experienced as goods, and in many ways they are. But they’re also the exact conditions that guarantee the breakdown of reciprocity at the systemic level. “Liberation” and “extraction” are the same project, viewed from different angles. This suggests that the solutions that would actually work are not ones we would accept. Constraints, friction, boundedness, inefficiency, waste, lack of safety, violence, the inability to optimize — these are the enforcers of honesty and mutualism.

We didn’t choose modernity, scale, or fungibility. These emerged because environmental and ecological conditions favored them. The move to scale, liquidity, fungibility — these weren’t chosen any more than the bee chose to become dependent on flowers. The ratchet works the same way: once the efficiencies exist, they outcompete the alternatives, and the capacity for anything else atrophies because it is continuously outcompeted. What feels like a series of choices is really just differential selection. The systems that scaled, scaled. The ones that did not, didn’t survive. Which means there’s no “we” standing outside the process who could have chosen differently, or could now choose to reverse it. The “we” that exists is already the product of these pressures — our preferences, our sense of what counts as freedom or deprivation, our inability to want the constraints that would restore reciprocity. The fruit didn’t choose to seduce us into eating it, the plant didn’t design the manipulation, the animal didn’t opt into the dependency. And neither did we choose modernity. We’re downstream in a selection process, mistaking its outputs for our preferences. The “agency” we feel is itself part of the machinery moving us along the gradient.

Understanding does not provide an exit.