Take Denmark’s full administrative record of workers and firms (every single-manager business, every birth and paycheck, from the early 1990s through 2017) and isolate one narrow fact: whether a male manager’s first child happened to be a daughter or a son. That’s close enough to a coin flip that it works as a natural experiment. Then watch what happens to hiring, pay, and promotion at his company afterward. That’s the design behind Daddy’s Girl: Daughters, Managerial Decisions, and Gender Inequality, accepted for publication in The Review of Economic Studies by Maddalena Ronchi of Northwestern University’s Kellogg School of Management and Nina Smith of Aarhus University, covered Oct 6, 2026 by PsyPost, Fast Company, and Aarhus BSS.

The finding, in short: after a male manager’s first daughter is born, women’s relative earnings at his firm rise 4.4%, and women’s employment share rises 2.9%. It happens fast. It lasts for years. And the firm doesn’t pay for it in sales, productivity, or labor costs. Mencius never ran a company and never saw a payroll spreadsheet. But in a conversation with King Xuan of Qi, sometime in the 4th century BCE, he laid out almost exactly this mechanism — care you already have, sitting unused one door down from where it’s needed, waiting on something to extend it.

The Quick Verdict

Question	What we found
What was studied?	Whether a male manager’s first child being a daughter (instead of a son) changes who his firm hires, pays, and promotes
Who ran it?	Maddalena Ronchi (Northwestern Kellogg) and Nina Smith (Aarhus University)
Where and when?	The Review of Economic Studies; covered Oct 6, 2026 by PsyPost, Fast Company, and Aarhus BSS
Data source	Danish administrative registry records, single-manager establishments that make up over 90% of Danish firms and roughly a third of total employment
Sample	6,701 cases where a male manager’s first child was born during the study window
Key numbers	Women’s relative earnings up 4.4%; women’s employment share up 2.9%, after a firstborn daughter
Mechanism	Mostly hiring: managers with a firstborn daughter became more likely to recruit and promote women into full-time, higher-paying, longer-education roles
What didn’t move	Firm sales, productivity, and labor costs: no detectable hit to any of them
What Mencius already argued	In the Mengzi (1A.7), a ruler governs justly only by extending (tui, 推) the natural care he already feels for his own family outward to people he’s never met

The Quick Version

A 2026 natural-experiment study found that when a male manager’s first child turns out to be a daughter, his firm starts hiring and paying women more, immediately, for years afterward, at no measurable cost to the business. Mencius described the same shape of mechanism to a king twenty-three centuries earlier: the king already knew how to care for his own family. Good government wasn’t a matter of acquiring a new feeling. It was refusing to stop that feeling at his own door.

What the Study Actually Found

Ronchi and Smith weren’t trying to catch anyone being sexist. They were trying to isolate something much harder to pin down: whether a manager’s personal attitude toward women (not his stated policy, not his HR training, his actual attitude) shapes what happens to women at his company. The problem with studying attitudes directly is that people are terrible, self-interested narrators of their own biases. So instead of asking managers what they believe, the researchers found a lever that moves belief without anyone choosing it: the sex of a first child, which is close enough to random that it functions like a coin flip nature already ran for them.

Using Danish administrative data covering single-manager establishments — small firms, averaging a dozen or so employees, but collectively representing the overwhelming majority of Danish businesses — they found 6,701 cases where a male manager’s first child was born during the study period. Comparing firms where that child was a daughter against firms where it was a son, the gap in outcomes for women showed up cleanly. Women’s relative earnings rose 4.4%. Women’s share of employment rose 2.9%. Ronchi and Smith’s analysis put this at somewhere between a fifth and half of the entire gap that normally separates firms run by male managers from firms run by female managers, closed, in part, by one man having a daughter instead of a son.

The effect wasn’t a slow drift. It showed up almost right after the birth and held for years, with some signs of strengthening as the daughter got older. And the mechanism wasn’t a vague shift in atmosphere. It was hiring. Managers with firstborn daughters became measurably more likely to bring women into full-time positions, higher-paying positions, roles requiring longer educations, the kind of jobs that had been going mostly to men. The firms didn’t pay for this in any way the data could detect. Sales, productivity, overall labor costs: unchanged. As Ronchi put it in PsyPost’s writeup, “Managers’ attitudes toward women can shape women’s opportunities at work — and those attitudes may change quite rapidly.” Smith’s framing, reported by Aarhus BSS, was blunter: “The figures show that male managers in small businesses generally develop a more positive view of women when they have a daughter.”

What Did Mencius Mean by Moral Extension (Tui)?

Tui (推), moral extension, is Mencius’s term for deliberately applying a feeling you already have toward one person to someone outside its original reach. In the Mengzi (1A.7), he tells King Xuan of Qi that the king already possesses what good government requires (he’s shown real compassion before), and that ruling well is simply refusing to let that compassion stop at the edge of his own household.

The passage opens with a story the king tells on himself. He once saw an ox being led to sacrifice, visibly terrified, and couldn’t bear it. He ordered a sheep substituted instead, even though he couldn’t fully explain why one animal’s fear moved him and not the other’s. Mencius seizes on this. The king, he says, already has the raw material of a good ruler: a compassion responsive enough to be moved by a frightened ox. What Mencius denies is that the king lacks the capacity to extend that same feeling to his starving subjects. “Your majesty’s failure to become a true king,” he tells him, “is not a matter of being unable. It is a matter of not doing it.” The capacity was never the problem. The extension was.

What that extension is supposed to look like, Mencius makes concrete a few lines later, in language later translators have rendered as something close to: treat the elders of your own family with the reverence due them, and extend that same treatment to the elders of other families; treat your own children with the care due them, and extend that same care to the children of other families. The Chinese term for this move is tui: push, extend, carry forward. Not a new feeling, manufactured from nothing. The old feeling, pushed past its usual border.

Why Did Hiring Change After Managers Had a Daughter?

1. The capacity for fairness wasn’t new. These were men who, presumably, already loved a wife, a mother, a sister. The daughter effect didn’t install compassion toward women from scratch. It gave existing compassion a new, personal object pointed at hiring decisions it hadn’t reached before.
2. The trigger was a relationship, not an argument. Nobody ran a diversity training on these managers between one child’s birth and the next. A new person entered their lives whose interests they personally cared about, and the caring didn’t stay contained to that one person.
3. It worked through concrete decisions, not sentiment alone. The study’s clearest finding wasn’t “managers reported feeling warmer toward women.” It was that specific women got hired into specific, better-paying, longer-education jobs they hadn’t been getting before.
4. It cost the firm nothing measurable. Sales, output, and labor costs held steady. Whatever had been keeping women out of those roles wasn’t competence-based efficiency. It was room that opened up once someone decided to look.
5. It rhymes with an argument that predates the dataset by about 2,300 years. Mencius’s whole case to King Xuan was that justice isn’t a feeling rulers lack; it’s a feeling they already have, applied too narrowly. A manager who already extends fairness to the women in his own family, suddenly extending it to the women on his payroll, is close to a working model of the thing Mencius was describing.

Why the Study and the Philosophy Rhyme

The connection here isn’t “a Warring States philosopher predicted a Danish payroll study.” It’s narrower, and it holds up better for being narrower: Mencius’s specific claim was that moral failure is usually a failure to extend an already-present feeling, not an absence of the feeling itself. This study found a case where the extension actually happened, mid-career, triggered by nothing more deliberate than who a man’s child turned out to be, and measured what changed once it did.

It connects directly to what the four moral sprouts argue about where virtue starts: Mencius’s claim that compassion exists in seed form in basically everyone, and that the real question is never whether the sprout is there but whether anything is cultivating it, or blocking it. The daughter effect looks like exactly this kind of cultivation, arriving by accident: something in a manager’s life finally watered a capacity for fairness that had been sitting dormant with respect to his female employees specifically.

It also sits close to Hierocles’ circles of concern, the Stoic model of ethical life as a set of rings (self, family, extended family, community, humanity) that the work of ethics is supposed to pull inward, not push outward away from you. Hierocles and Mencius are making structurally the same argument from different traditions: the moral task isn’t inventing new concern for strangers. It’s dragging the ring that already contains your daughter a little closer to the ring that contains your employees, until the gap between them stops mattering as much.

And it connects to Confucius’s account of ren, the benevolence Mencius inherited and systematized, relational by nature, meant to move outward through genuine human connections rather than exist as an abstract rule. The study is, in effect, a quantified instance of ren moving through a relationship exactly the way Confucius and Mencius both insisted it has to: not top-down, from principle to person, but person to person, outward from the one you already love.

The Gap Between a Parable and a Panel Dataset

Here’s where the comparison gets more interesting than a clean match. Sit with it instead of smoothing it over.

Mencius’s whole argument to King Xuan was that extension should be a deliberate, cultivated act: the king reasoning his way from “I felt this for an ox” to “I should feel this for my starving subjects,” and choosing to close that gap on purpose. That’s the harder, more demanding version of the idea, and it’s the one Mencius actually cared about. The spontaneous pity for the ox wasn’t the achievement. It was the raw material the king still had to do something with.

The daughter effect doesn’t obviously look like that. Nothing in the data shows these managers reasoning their way to fairness. A person they loved happened to be born female, and their behavior shifted, closer to the ox moment than to the deliberate extension Mencius pushed the king toward. Sit with the uncomfortable version: if fairness toward women depended on a manager’s biological connection to one particular woman, that’s a long way from the principled, universal extension Mencius had in mind. Whether this reflects a changed principle or just redirected affection that happens to help whoever’s standing near it is a real question the data can’t answer — and the honest reading of Mencius suggests he’d have wanted it asked too.

What This Study Doesn’t Show

Be precise about the size of this: the framing invites more confidence than the data earns.

A Clean Natural Experiment, Not a Randomized Trial

A first child’s sex is close to random, which gives this study real causal footing a plain correlational study lacks. The researchers aren’t just noticing that fair managers tend to have daughters. But “close to random” isn’t a controlled experiment, and the comparison only holds within the population studied.

Danish Small Firms, Not Global Corporations

This is Danish data, from single-manager establishments averaging a dozen employees apiece. Whether the mechanism holds inside a multinational, under a different country’s labor law, or in a hiring process with less discretion in any one person’s hands is untested.

Male Managers With Daughters, Specifically

The study doesn’t tell us what happens when a female manager has a son, or whether the effect reverses for any other combination. It isolates one trigger: a man’s relationship to a newborn daughter, and measures what that trigger does.

Decisions, Not Beliefs

The data shows hiring patterns changed. It can’t confirm a manager consciously extended a feeling the way Mencius describes, rather than simply noticing female candidates more because a daughter made gender salient to him generally. Both would produce the same numbers.

What Actually Follows From This

1. Fairness is often a matter of what’s already there, pointed somewhere new. If a manager can treat the women in his own family well, the missing ingredient for his employees usually isn’t a capacity he lacks. It’s a reason that capacity hasn’t been pointed in that direction yet.
2. Don’t wait for a personal trigger if you don’t have to. The study’s finding is encouraging precisely because the mechanism is so narrow and accidental, which also means a conscious decision to extend fairness shouldn’t need a daughter to arrive first. Mencius’s whole argument to the king was that you can choose the extension before life hands it to you.
3. Ask what’s being extended, and to whom it stops. A manager whose fairness widened toward women after a daughter’s birth is still worth asking: does it stop there? Mencius’s test for a ruler wasn’t whether he could love one group well. It was whether that love kept traveling once it started.

Mencius never met a Danish manager and never saw an administrative dataset. He had a king who’d shown he could pity an ox, and a conviction that the gap between that pity and a well-governed state wasn’t a gap in feeling — it was a gap in reach. Twenty-three centuries later, a researcher found 6,701 cases of men whose capacity for fairness toward women didn’t need to be built from nothing. It needed a reason to travel one door further than it already had. The ox was never the point. Neither, really, is the daughter. What both stories are actually about is how far a feeling you already have is willing to go once something finally asks it to.

---

This post discusses a 2026 study accepted for publication in The Review of Economic Studies and Mencius’s dialogue with King Xuan of Qi in the Mengzi (1A.7). The study’s findings come from Danish administrative data on single-manager establishments and describe a specific, well-identified mechanism, not a general claim about all managers, all countries, or all forms of workplace bias.