Between the Buckets

The mechanism

Institutions do not allocate to risks, they allocate to buckets, each with a mandate, a benchmark, a return target, and a person whose job it is. The traditional set has been unchanged for forty years: public equity, public fixed income, cash and equivalents, real assets such as property and infrastructure, and alternatives such as private equity, hedge funds, and venture. The consequence is that an asset's fundability depends on whether it resembles a category, not on its risk-adjusted return. An instrument with excellent risk and reward that matches no mandate has no natural buyer, not because anyone judged it and declined, but because nobody's job description contains it.¹

Two live examples illustrate the gap. Hybrid equity, private capital that is safe but does not clear the high return bar alternatives require, has no natural home: not public, not high-return enough for alternatives, yet with the best risk and reward available. It has become one of the fastest-growing segments in private credit precisely because it was homeless. Private investment grade is the second example: most of what sits in an institution's fixed-income bucket is public, so the bucket itself is not a source of capital for privately originated investment-grade debt, and excess return has been earned there specifically because private but investment grade is not a bucket.¹

Why the return is real, not just an illiquidity premium

The distinction this turns on is that the gap is not a story about being paid to bear illiquidity, it is a story about absent price-setters. In a bucket with a dedicated allocator, competition drives price toward fair value continuously. In a gap, the marginal buyer is whoever happened to notice, a much worse auction for the seller and a much better one for the buyer. That also predicts the decay: as institutions grow and adopt total-portfolio approaches rather than bucket-by-bucket ones, family offices already do, and a general migration is underway that closes the gap as it gets exploited. A between-the-buckets return is therefore always a temporary return, and the durable skill is finding the next gap.¹

The general form

Strip out finance and this becomes a claim about how institutional attention allocates: value accumulates wherever the org chart has a seam. The pattern recurs elsewhere. Financeability as Industry Screen describes Brad Jacobs identifying industries that trade cheap because few financiers will fund them, independent of the underlying unit economics, the same absent-buyer mechanism applied to whole sectors. Mispriced Talent Pools names people no recruiting pipeline is assigned to. Schlep Blindness names problems no founder wants to touch and that therefore stay uncontested. In each case the seam, not the underlying asset, is what is mispriced.

Caveat

"No one is assigned to the risk" and "no one has priced the risk" are not the same sentence, even though the argument implicitly treats the first as proof of the second. Sometimes a gap exists because the risk is genuinely bad and every allocator who looked at it declined for reasons that never made it into a mandate document. The real test is whether the assets in the gap perform through a full cycle, and the private investment-grade book has not yet been through one at this scale.

How a bucket actually splits

The claim predicts its own decay: the gap closes as institutions migrate to total-portfolio approaches. A separate 2024 interview catches the decay in progress and supplies the actual mechanism, which turns out not to be allocators becoming cleverer. Fixed income for institutional clients has historically been entirely investment grade and entirely public; the same fixed-income allocation is now dividing between public investment grade as the beta piece and private investment grade as the alpha piece, and this is happening simultaneously in family offices, pension funds, endowments, and sovereign wealth funds.² The gap does not close by being noticed, it closes when an existing bucket splits in two, so the previously homeless asset acquires a category and a person whose day job it is. That is a more useful prediction than simply "the inefficiency decays," because it names what to watch for: not allocator sophistication, but the appearance of a new line item.

The unlock, in this account, is governance rather than analysis. A portfolio manager could not previously move money into private investment grade not because they had failed to notice the spread, but because they could not defend the trade if it went wrong. Rating agencies supply that defense by certifying that a private instrument and a public one carry the same risk grade, which turns the decision from "am I taking more risk," a career-ending question if wrong, into "how much yield for less liquidity," a normal allocation choice.² A category boundary dissolves, in general, when a credible outside party will certify equivalence across it, which is also why the same split has not yet happened in equity, where no such arbiter exists.

Confirmation from the segment data

Comparing figures given roughly sixteen months apart shows hybrid equity industry-wide roughly doubling in size, from roughly fifty billion dollars to roughly one hundred billion dollars, while traditional private equity stayed flat at roughly one hundred billion dollars over the same period.²¹ The category with no institutional home grew; the category with a well-staffed, well-benchmarked home did not. That is exactly what the underlying claim predicts, observed rather than merely asserted.

The counterexample in the room

One interviewer's own fund, mandated to public markets only, produces the sharpest live illustration of the mechanism in the 2024 interview. Asked what a public-only mandate is losing out on, the answer given was direct: roughly eighty percent of the investable market.² A mandate written in the vocabulary of listed securities is a bucket boundary with legal force, the strongest possible form of the mechanism this concept describes.