The Asset That Became a Flow

23 min read

There is a number in Heidrick & Struggles' 2026 report that should unsettle more than it celebrates: requests for interim COOs grew 250% in a single year [1]. It is not an isolated figure. Requests for CEOs and presidents rose 38% year over year; demand for interim C-suite leadership has compounded to 151% growth since 2021; and interim CFOs now account for 51% of all temporary leadership requests [1]. Read slowly what this means: the role that exists precisely to know a company's financial entrails — its commitments, its skeletons, its accounting memory — has become the most rented position at the top of the hierarchy. The chief financial officer, historical guardian of continuity, is now the most fungible piece on the board.

Sunny Ackerman, who authors the report, frames it as a triumph: independent talent, she writes, "are moving to the center of how critical work gets done" [1]. And from the vantage point of the market Heidrick operates in, it is a triumph — liquidity has risen, matching has accelerated, finished specialization finds a buyer in days rather than quarters. But read through the lens of brain capital, the sentence describes something else: the conversion of executive judgment — the slowest-forming asset in the entire economy — into a spot commodity. What is being rented at 250% annual growth is not working hours. It is accumulated judgment: the capacity to decide well in contexts that never repeat, distilled over decades inside organizations that paid for that distillation.

This is the thesis this essay will sustain, with the sources arbitrating against one another: the economy that celebrates cognition "on tap" — human leadership rented at record pace, or agentic artificial intelligence — is consuming an estate whose reconstitution it has stopped financing. Brain capital liquidity is not a new model of value creation. It is the liquidation of a stock formed by the previous regime — the long, broad, slow employment regime — that the very existence of the rental market erodes. Every interim leader today was formed by yesterday's permanent job. And no one is forming tomorrow's.

For more than half a century, human capital theory — from Gary Becker to the organizational economics descended from it — rested on a premise so obvious it was rarely stated: companies invested in training their people because they expected to keep them. The long career was the financing vehicle for judgment. The large corporation functioned as an implicit school: internal rotations, mistakes absorbed by the organization, gradual exposure to decisions of growing complexity, unbilled mentorship. The permanent employment contract was, in practice, a capitalization contract — the company advanced decades of learning against the promise of harvesting mature judgment at the end. The 151% growth in interim leadership since 2021 [1] measures, above all, the quiet dissolution of that contract: mature judgment came to be bought ready-made, and the question of who produces it was left orphaned.

Microsoft's Work Trend Index gives this mutation its sharpest vocabulary: "intelligence on tap," human-agent teams, a human-to-agent ratio proposed as a new management metric [2]. Intelligence as a utility — turn on the tap, pay for the flow, turn it off. The temptation is to attribute the change to the tool: AI agents made cognition liquid, therefore liquidity is AI's offspring. But Heidrick's data dismantle that causality with unintended elegance: the same rental logic appears exactly where agents don't reach — in the executive presidency, in operations leadership, in financial leadership, with increases of 38%, 250% and 14% respectively [1]. When the same pattern appears where the tool is absent, the tool is not the cause. AI is one instance — the most visible, not the deepest — of an earlier mutation: cognition changing status, from an owned asset to a rented flow. The convergence between the two reports, reached by independent routes, confirms that the phenomenon is structural, not sectoral. And neither asks the next question: where will what they rent continue to come from.

Among Heidrick's numbers there is one that deserves a contrarian reading: demand for human capital specialists — workforce planning, organizational change — grew 129% in a year [1]. The report presents this as proof of market sophistication. But Darrell Rigby and Zach First, in the January–February 2026 Harvard Business Review, offer the inverse key: "Too much change can traumatize your organization" — and the remedy they propose is not to manage constant transformation better, but to minimize the need for it [4]. Read against the HBR, the 129% stops looking like a solution and starts looking like a symptom: organizations outsourcing the management of their own perpetual mutation instead of stopping it. It is human energy rented to compensate for architectural failures — a pattern this outlet has already described in relation to organizational exhaustion, and which here reappears with a price tag. The prior issue of the same magazine proposed Jana Werner and Phil Le-Brun's "Octopus Organization" as a model of adaptability [11]; the market, meanwhile, chose the opposite path to internal adaptation — buying externally, piecemeal, what the organization no longer secretes from within.

The arbiter of this dispute arrives from where least expected: a study on exceptional achievement cited by The Economist on 17 January 2026. Its conclusions are uncomfortable for any model of talent acceleration: child prodigies rarely become adult prodigies, and the mechanism that best predicts mature excellence is what researchers describe as "search and match" — broad interests, prolonged exploration, late specialization [6]. Now, Heidrick's spot market pays precisely for the finished product of that process: finance, FP&A, PMO leadership, transformation — finished specialization, immediately available, with interim CFOs absorbing 51% of requests [1]. The collision is head-on and no one flags it: the market buys the outcome of a slow, broad, protected path — and its own logic makes that path impossible to finance. You cannot do "search and match" over twenty years in an economy that hires by the day. Renting presupposes the stock; the stock presupposes the regime that renting is destroying.

The brain capital lens reveals here what conventional lenses — labor market, technology, operational efficiency — let slip: the difference between price and reproduction. The independent talent market is forming prices with growing precision; it is not forming talent. And the distinction between what commoditizes and what escapes commoditization is already visible at the top of the distribution. Michael Steinberger, in his portrait of Alex Karp, documents the limit case: Palantir's co-founder received a compensation package of $1.1 billion in 2020, becoming the highest-paid CEO of a publicly traded company that year [8]. Note that this sum was paid to a mind defined by absolute non-fungibility — a man who never learned to drive, who communicated almost exclusively in German with Austrian and Swiss aides, and whose personal obsessions shaped one of Silicon Valley's most controversial companies [8]. The contrast with the 51% of interim CFOs is not anecdotal: it is the photograph of brain capital's bifurcation. The middle of the cognitive distribution — competent, certified, interchangeable — becomes a commodity rentable at efficient-market prices; the non-negotiable idiosyncratic, that which no platform can standardize, takes refuge at the extreme and captures monopoly rents. Liquidity does not distribute value: it concentrates it in what refuses to be liquid.

This outlet wrote, in April, about the extraction of knowledge — intellectual work converted into AI infrastructure, the estate of thinkers turned into raw material for those who orchestrate agents. What the 2026 numbers show is the next step of the same logic: it is no longer just accumulated knowledge that is extracted; it is the human being at the top who becomes rentable infrastructure, and the victim has shifted from the stock to the process that produced it. Graham Weaver, who spent roughly twelve years studying how to win without crushing the soul, describes thirty years spent "running" — from high school through university and career, always anticipating that the next phase would finally bring the feeling of being enough, which never came [7]. His testimony and the study cited by the Economist converge, by routes that have nothing in common, on the same verdict: the acceleration model misjudges what actually creates value. Weaver's individual race is the intimate version of the liquidation the Heidrick numbers measure at market scale — and it is through this door, that of the human cost on a balance sheet no one consolidates, that the argument must continue.

The human cost has an accounting counterpart, and it is that which the brain capital lens forces us to see: when an organization replaces a permanent officer with an interim leader, it is not merely swapping one contract for another — it is moving judgment from the asset side to operating cost. Heidrick & Struggles' numbers, read this way, stop describing a labor market and start describing a balance sheet: requests for CEOs and presidents growing 38% in a year, interim COOs up 250%, CMOs 100%, and demand for interim C-suite leadership that has compounded 151% growth since 2021 [1]. Sectoral concentration — healthcare and life sciences, consumer goods, technology and services — confirms this is not a niche: these are precisely the sectors where competitive advantage depends on specialized judgment, and they have been the fastest to convert it into rented flow [1]. And the most requested skills — finance, FP&A, project management and PMO leadership — are exactly those that demand the most years of maturation inside real organizations, with real mistakes and real consequences [1]. The spot market buys maturation; it does not produce it.

The official thesis attributes this mutation to artificial intelligence, and this is where arbitration becomes necessary. Microsoft's Work Trend Index describes a world of "intelligence on tap": human-agent teams, a new human-to-agent ratio as a management metric, cognition available on tap like electricity [2]. But if AI were the cause, the rental pattern should be weaker precisely where agents don't reach — and it is there that it is most pronounced. No agent replaces an interim CFO before a board of directors, and yet interim CFOs account for 51% of all interim leadership requests recorded by Heidrick [1]. When the same phenomenon appears with and without the tool, the tool is not the cause: it is an instance. Cognition changed status — from owned asset to contracted flow — and AI merely extends to the middle of the pyramid a logic the top had already adopted on its own account. The convergence between Heidrick's "independent talent moving to the center of how critical work gets done" and Microsoft's intelligence on tap is not a coincidence of language: it is the same mutation seen from two different floors of the building [1][2].

The report's most revealing figure is also its most uncomfortable one when set against contemporary management literature: demand for human capital specialists grew 129% in a year [1]. Heidrick presents this as proof of sophistication — companies taking workforce planning seriously. Rigby and First, in the January–February Harvard Business Review, provide the inverse reading: "Too much change can traumatize your organization," they write, arguing that the remedy is not to manage constant transformation better, but to minimize the need for it [4]. Read against the HBR, the 129% stops looking like a solution and starts looking like a symptom — organizations outsourcing the management of their own perpetual mutation instead of stopping it, renting firefighters instead of ceasing to set fires. The prior issue of the same magazine points the same way by another route: Christopher Marquis proposes "strategic hibernation" as a resilience model, and Werner and Le-Brun propose the "Octopus Organization" as an adaptive architecture [11] — both structural alternatives to what the interim market monetizes as a service. And there is a parallel data point that reinforces the suspicion: Işık and Goswami, in MIT Sloan Management Review, show that AI risk management lags in organizations due to internal cultural and structural problems [12] — precisely the kind of problem no specialist rented amid 129% annual growth can solve from outside, because culture cannot be hired by the hour.

It is here that the Economist enters as arbiter of the dispute — not over whether the rental market works, but over where what it rents comes from. The study on exceptional achievement cited in the 17 January issue is categorical on one point: child prodigies rarely become adult prodigies [6]. The mechanism that best predicts adult excellence is the inverse of acceleration — broad interests, prolonged exploration, late specialization: a "search and match" process that requires protected time, tolerance for deviation and, above all, structures that finance unproductive years before talent finds its fit [6]. Now, those structures used to be called careers. Permanent employment, with all its supposed rigidity, was the long-term financing vehicle for judgment: it paid for years of broad search, absorbed the cost of formative mistakes, and delivered, after two decades, the CFO who today accounts for 51% of interim requests [1][6]. The incompatibility is structural, not cyclical: the spot market only buys the finished product of a process whose logic — slow, broad, late — the spot market itself has made impossible to finance.

What this lens makes visible, and none of the sources sees alone, is the depreciation no one accounts for. Every interim leader hired in 2026 was formed by yesterday's permanent job — by an organization that paid, unwittingly, for the positive externality Heidrick now lives off. The report celebrates that independent talent has moved "to the center of how critical work gets done" [1]; Microsoft celebrates intelligence on tap [2]; neither asks who pays for the next tap. A market that rents judgment without financing its formation is not creating value: it is consuming a vintage. And vintages, by definition, run out — not suddenly, but cohort by cohort, as the generation formed in stable careers ages and the next generation, raised in flow, reaches the top without the 20 or 30 years of broad search the Economist identifies as the raw material of adult excellence [6].

For a board of directors, the implication is not nostalgic — it is allocative. If the middle of the cognitive distribution commoditizes (interim CFOs at 51%, COOs at +250%) and the idiosyncratic captures monopoly rents (Karp's $1.1 billion in 2020 [8][1]), then the board's question stops being "what talent do we rent?" and becomes "what cognition do we insist on owning?". Cook and Nohria, in the November–December HBR, offer the criterion: the best CEOs don't accumulate talent — they build systems and cultures that help everyone execute better [9]. That is precisely the internal formation engine that renting does not replace. The company that rents everything rentable and cultivates nothing ends up with a cognitive balance sheet made exclusively of short-term liabilities — efficient until the day the market, having exhausted the stock it inherited, has nothing rare left to rent it.

BOX — The Cognitive Vintage: stock, flow and invisible depreciation

Call it the cognitive vintage: the stock of judgment accumulated by a generation of executives formed in long, broad, slow careers, which the on-demand talent market consumes without replenishing. The fundamental distinction is an accounting one. A flow is rented and paid for by the day; a stock is built over decades and depreciates silently. The systemic error of 2026 is treating the latter as though it were the former.

The stock forms through a mechanism the Economist documents: broad search, late specialization, "search and match" [6]. There is no known shortcut — accelerated prodigies rarely convert into adult prodigies, and Graham Weaver's testimony, thirty years spent "running" without any achievement ever producing the feeling of being enough, is the intimate version of the same verdict [6][7]. What creates top-tier cognitive value is slow; what the market buys is immediate.

Flow, in turn, is measured in Heidrick's numbers: +38% in CEO requests, +151% in interim leadership since 2021, 51% of all requests concentrated in interim CFOs [1]. Each of these transactions is rational for both buyer and seller. The irrationality is aggregate: no one, at any point in the chain, finances the formation of the stock that all these transactions presuppose.

Depreciation is invisible because it does not appear on any individual balance sheet. The company that rents an interim COO does not record the vintage's wear; nor does the platform that places them; the executive himself, monetizing decades of training paid for by previous employers, even less so. It is the classic tragedy of the commons, transposed onto cognition: the pasture is the judgment accumulated by the previous employment regime, and every shepherd is innocent.

The extreme of the distribution confirms the rule in reverse: the $1.1 billion paid to Alex Karp in 2020 [8] is the market price of what no tap supplies — an unnegotiably idiosyncratic mind. When the middle liquefies, rents take refuge in what refuses to be liquid. For the board, the lesson is direct: identify which cognition, within the house, is vintage rather than flow — and protect it, because the market no longer produces it.

Implications for decision-makers

For the CEO, the first consequence is an accounting one before it is strategic: the company's balance sheet does not distinguish between rented cognition and owned cognition, and that blind spot has a price. Heidrick & Struggles' report documents that requests for CEOs and presidents grew 38% year over year and that interim C-suite leadership has compounded +151% since 2021 [1] — figures any board reads as flexibility won. Read through the brain capital lens, they say something else: a growing share of the company's decision-making capacity has left the perimeter and entered the market, subject to spot pricing, competing demand and unavailability at the critical moment. The question the board should ask is not "how much does renting cost?" but "which decisions have we stopped knowing how to make on our own?" — because the second bill never appears on the first.

For the investor, the bifurcation the data reveal redefines where to look for durable rents. The same market that treats the CFO as a fungible unit — 51% of all interim leadership requests concentrate in that function [1] — paid Alex Karp $1.1 billion in 2020, the largest package of any publicly traded CEO that year [8]. The implication is direct: as the middle of the cognitive distribution commoditizes, the premium migrates to the non-negotiable — to cognition that has no substitute in the spot market. In valuing a company, the relevant question stops being "what talent does it have?" and becomes "what talent does it have that cannot be rented?". That is the fraction of human capital that sustains multiples; the rest is operating cost by another name.

For those managing transformation, cross-reading the HBR with Heidrick forces a diagnostic inversion. Rigby and First argue that "too much change can traumatize your organization" and that the remedy is to minimize the need for constant transformation [4]; Heidrick, meanwhile, records 129% growth in a year in demand for human capital specialists [1]. Read together, the two data points suggest that a significant share of transformation-talent demand is not leverage — it is painkiller. Organizations that need to rent, year after year, someone to manage their own mutation are not solving a skills problem; they are masking an architecture problem. The clear-eyed decision-maker treats every renewed interim contract as a diagnostic signal, not a renewed solution: if the same type of gap reappears three quarters running, the gap is not one of people — it is one of design.

For the talent officer, the Economist's evidence on exceptional achievement — early prodigies who rarely become adult prodigies, and the "search and match" mechanism as the best predictor of excellence [6] — has an uncomfortable operational translation: high-potential acceleration programs, as usually designed, optimize for the wrong indicator. Early specialization produces visible performance early and scarce judgment late; broad search produces the reverse. In an economy where finished judgment is rented by the day [1] but no one finances its formation anymore, the company that maintains long, broad, protected paths will be building, almost alone, the asset all its competitors will have to rent. It is a position of structural arbitrage — expensive in the short term, monopolistic in the long run.

For the board as a whole, the final implication is one of governance: the ratio between owned cognition and rented cognition should become a regular reporting metric, treated with the same seriousness as financial leverage. Microsoft's report on the frontier of work already proposes the human-to-agent ratio as a management metric for "intelligence on tap" [2]; the same discipline should apply to the human tap. A company whose critical decisions depend, in more than half of cases, on external cognition — interim, advisory or agentic — is leveraged in an asset it does not control, in a market whose stock, the data suggest, is depleting without replenishment [1][6].

The liquidity paradox

The central tension of this analysis is that talent liquidity appears to solve exactly the problem it worsens. The company that rents an interim COO — a segment whose demand grew 250% in a year [1] — obtains immediate execution and avoids the cost of internally forming that capacity. But every rational rental reduces the incentive, across the whole economy, for the long-term investment that produced that COO in the first place. The spot market is efficient at allocation and destructive at formation: it perfectly allocates a stock while preventing it from replenishing. It is the cognitive version of unregulated fishing — every boat is rational, the fish stock is finite, and each catch's efficiency accelerates the collapse of the whole.

The paradox deepens when one observes who benefits from the liquidity. Today's interim executive monetizes, at spot-market prices, decades of training that previous employers paid for under the permanent employment regime [1]. It is the perfect deal for their generation — and impossible for the next, because the employers who would pay for that training are, precisely, replacing it with renting. Brain capital liquidity is, in this exact sense, an intergenerational transfer disguised as market innovation: the generation formed by the old regime sells the new regime what the new regime no longer produces.

There is a second, subtler tension between discourse and mechanism. Heidrick states that independent talent is moving "to the center of how critical work gets done" [1] — and it is right on the descriptive plane. But critical work, by definition, is work whose context matters: top-level decisions depend on knowing a company's history, the board's balances of power, the scars of past crises. Rented cognition arrives without that context and leaves before accumulating it. The more critical the work, the greater the context discount — and yet it is precisely in the most critical work, the C-suite, that renting grows the most [1]. The market is applying commodity logic to the segment where commodity logic least applies.

The third face of the paradox is temporal. Weaver describes thirty years spent "running," in which every anticipated achievement never produced the feeling of being enough [7]; the Economist shows that excellence forced early rarely survives into adulthood [6]. The economy of liquid cognition institutionalizes exactly that race: careers fragmented into short mandates, evaluated by immediate deliverables, without the broad stretch of time in which "search and match" operates. The system that most depends on mature judgment is the one that least tolerates the conditions under which judgment matures.

What comes next

The most likely scenario for the 2027-2030 horizon is the continuation of the bifurcation already visible in the data. The middle of the cognitive distribution — specialized, replicable, well-documented functions — will keep commoditizing, pressured simultaneously by the human interim market [1] and by agents' "intelligence on tap" [2]. Prices in that layer will fall as agentic supply matures; the interim CFOs who today account for 51% of requests [1] will face, within a few years, competition from systems that execute FP&A without fatigue or notice. The idiosyncratic extreme, by contrast, will see its premiums grow — the Karp precedent [8] is not an anomaly, it is an early signal of where rents take refuge when everything else becomes liquid.

The second scenario, less visible but more consequential, is the exhaustion of the vintage. If the stock of top-tier judgment was mostly formed by the stable employment regime, and that regime is contracting rapidly, then sometime in the next decade the interim market will face a supply problem that none of the current reports anticipates [1][2]. The first symptoms will be subtle: lengthening placement times, fee inflation without quality improvement, recycling of the same names through ever-faster rotation. When those signals appear, companies that maintained internal formation capacity will be in the position of holding the only mine in an economy of traders.

The third scenario is the intelligent organizational response: the emergence of companies that treat judgment formation as a deliberate competitive advantage, not an inherited cost. The lesson from private equity that the HBR documents — "successful PE firms have found a more straightforward way to create surplus value" [3] — applies here by analogy: the surplus value of the next decade will lie in owning the formation process, not just the product. Companies offering long, broad, protected paths — the opposite of the interim mandate — will attract precisely the young talent that understands the spot market only pays well those already formed by someone else. Scarcity will reverse bargaining power: those who train retain; those who rent compete at auction.

There remains the grim scenario, which the data make impossible to ignore: that no one fixes anything, because no individual actor has an incentive to do so. Every quarter of interim-market growth [1] confirms, for each participant, that the model works. The stock's depreciation will only become visible once it is aggregated — and by the time it is aggregated, it will be late. Tragedies of the commons are rarely resolved by spontaneous shepherd lucidity; they are resolved when someone fences off a pasture and proves the fence pays.

Conclusion

What this lens ultimately reveals is a silent inversion in the nature of human capital: for a century, companies owned cognition and rented capital; in 2026, they rent cognition and own capital. Heidrick's numbers [1], Microsoft's tap [2] and Karp's premium [8] are three snapshots of the same movement — intelligence changing accounting status, from an asset that is cultivated to a flow that is contracted. The change appears neutral because every transaction is voluntary and every price is fair. But spot prices only measure the value of what exists; they have never measured the cost of ceasing to produce it.

The board that understands this first will have a decade's head start over those still celebrating flexibility. Because judgment — the only raw material this market trades — cannot be manufactured at the speed at which it is rented, and the stock now in circulation was paid for by a regime that circulation itself is extinguishing. Renting intelligence is easy; what is hard, and decisive, is being the last house that still knows how to make it.