A new paper in the Quarterly Journal of Economics finds that Swiss mothers who underestimate the long-term financial cost of part-time work, when shown better information, increase their contracted hours by 7%. The authors estimate this could close nearly 20% of the gender gap in lifetime income and pension wealth among teachers.
The finding is technically correct. But it misframes the problem.
The paper treats the child penalty—mothers’ earnings falling sharply relative to fathers’ after a first birth, and never recovering—as an information problem. Women aren’t fully accounting for long-term costs. Fix the information, fix the behaviour. A low-cost, scalable intervention. The paper’s own data undercuts this: for roughly three quarters of mothers in the study, incomplete information wasn’t the barrier. They understood the costs. They reduced their hours anyway. The intervention has nothing to say to them.
What the paper cannot see (and doesn’t look for): the pension system these women are being optimised to protect depends entirely on the existence of future workers. Those workers have to come from somewhere. Someone has to absorb the cost of producing them. Right now, that cost is almost entirely private—borne by the people who reduce their hours, exit their careers, or forgo the pension wealth the paper is trying to recover. The fiscal architecture assumes fertility. The labour market punishes it. The information intervention patches the symptom while the contradiction compounds.
This is what John Seddon called failure demand: demand generated by a system’s failure to do something right in the first place. Every information campaign aimed at individual mothers is failure demand management—handling the consequence more efficiently while leaving the cause intact.
The child penalty is not a distortion to be corrected at the margin. It is windfall being extracted from one group and booked as structural by everyone else. The pension system. The tax base. The longevity dividend that Andrew Scott documents in The Longevity Imperative—more productive years, more area under the curve—flows disproportionately to those who minimised their caring burden in the first place. Three consecutive systems, each compounding the original extraction.
The fertility decline is not a mystery. It is people correctly solving the optimisation problem the system has set them. The world is pushing back. That’s the signal. We’re responding by making the failure demand more efficient—better information, more accurate projections, scalable interventions.
The frame that needs to change is the one that treats children as a private consumption decision and then borrows their future earnings to fund everyone’s retirement. Until that changes, we’re not closing a gender gap. We’re optimising our way to the thing we’re trying to avoid.