Finance leaders tend to think of reporting as observation. You measure what's happening, you put it in the pack, you send it upward. The numbers describe the business; they don't change it. Reporting is the mirror, not the thing in the mirror.

That's not how it works. The moment a number goes into the pack and somebody becomes accountable for it, it stops being a description and starts being an instruction. People move toward what they're measured on, which means every metric you report is quietly steering the business, whether or not you intended it to. Your reporting pack isn't a mirror. It's a steering wheel, and someone has been turning it.

The Law Nobody In Property Management Talks About

In 1975, a Bank of England economist named Charles Goodhart noticed something inconvenient about monetary policy. The Bank had found reliable relationships between certain money-supply measures and inflation, so it started targeting those measures. The relationships promptly broke down. His conclusion, in its original dry phrasing: any observed statistical regularity tends to collapse once pressure is placed on it for control purposes.

Twenty years later the anthropologist Marilyn Strathern boiled it into the version everyone quotes now, and it's worth reading slowly. When a measure becomes a target, it ceases to be a good measure. That single sentence turned an observation about statistics into a statement about how human organizations behave.

There's a good academic treatment of Goodhart's Law here.

The classic illustration is a Soviet nail factory. Set the target as the number of nails produced and the factory delivers millions of tiny, useless nails. Change the target to total weight and it delivers a handful of enormous, useless ones. In both cases the factory hit its target perfectly. In both cases it produced nothing anyone could build with. That's Goodhart's Law: nobody cheated, nobody was lazy, everybody did exactly what they were measured on.

Every Metric Is a Proxy, And The Gap Is Where The Trouble Lives

Here's the mechanism, because understanding it is what lets you work around it.

You never actually measure the thing you care about. You care about a healthy, well-performing asset, which is not a number. So you pick a stand-in that usually moves with it, like occupancy. And under no pressure, that indicator behaves beautifully, because when people are simply doing good work, it rises alongside the real goal.

Then you make it a target. And now there's an incentive to move the number, not the goal. Since a proxy is by definition an imperfect stand-in, there is always a gap between the measure and the thing it represents. Pressure finds that gap. People will close the distance to the target through the path of least resistance, and that path is almost never the one you had in mind. The proxy hits its number. The underlying reality quietly detaches from it.

What This Looks Like In a Property Portfolio

You don't need Soviet nails to see it. It's in your reporting pack right now.

• Occupancy. Hold the team to 95% and they will get you 95%. They'll do it with concessions that gut effective rent, with marginal applicants who become next year's delinquency, and with flat renewals that keep the unit filled and the income flat. Occupancy was supposed to be a proxy for a healthy asset. As a target, it becomes a number you can hit while NOI slides underneath it.

• Speed to lease. Push days-on-market hard enough and screening gets quietly looser, because the fastest way to fill a unit is to be less careful about who fills it. You've optimized the metric and imported the risk.

• Maintenance ticket close rate. Measure how fast tickets close and tickets will close fast. Whether the actual problem got fixed is a different question, and it's not the one you're asking. Watch the reopen rate if you want to know what really happened.

• Maintenance cost per unit. Squeeze it and it comes down, because deferring work is the easiest way to spend less this quarter. You've turned an operating expense into a capital expense and moved it into the future, where it will be someone else's line item.

• Renewal rate. Target it and renewals will happen, at whatever price it takes. Retention looks excellent in the pack. Rent growth quietly stops.

Notice what all of these have in common. Nobody did anything wrong. The team did precisely what the reporting asked of them, and the reporting asked for the wrong thing without ever meaning to.

Finance Is Writing The Incentive System, Usually By Accident

This is the part that should get a CFO's attention, and it's the reason this is a finance problem rather than an operations one.

The reporting pack is the most powerful behavioral document in your company. It tells every manager, unambiguously, what they will be judged on, and people are extremely good at working out what's really being asked of them. So the choice of what goes into the pack, made in a finance meeting, quietly determines how leasing agents treat marginal applicants, how maintenance coordinators close tickets, and what gets deferred at year-end.

Very few finance teams see themselves as designing incentives. They see themselves as reporting facts. But the incentive system exists whether or not anyone designed it, and if you didn't design it deliberately, then it was designed by accident, by whichever metrics happened to end up on the dashboard. The reporting isn't downstream of the business. It's upstream of the behavior.

You Can't Pick a Perfect Metric, So Stop Trying

The instinctive response is to search for a better metric, one that can't be gamed. That search never ends, because there isn't one. Any proxy has a gap, and any gap can be exploited under pressure. Swap occupancy for effective rent and people will find the seam in effective rent.

What works isn't a better single number. It's refusing to let any single number stand alone.

Pair every metric with the thing it would damage if it were gamed, and report them together:

• Occupancy alongside effective rent per unit, so filling units by discounting shows up immediately.
• Speed to lease alongside delinquency and early-termination rates at six months, so a fast bad tenancy can't hide.
• Ticket close rate alongside reopen rate and first-time-fix rate, so closing without fixing is visible.
• Maintenance spend alongside deferred work and asset condition, so saving money by neglect stops looking like saving money.
• Renewal rate alongside rent growth on renewals, so retention bought with flat rent is legible as the trade it is.

The logic is simple. If someone games the first number, the second one moves the wrong way. The pair is much harder to fool than either number on its own. You're not trying to find an ungameable metric. You're trying to make the gaming visible.

Reported Alone Versus Reported In Pairs

The left column can be hit while the business gets worse. The right column can't, or at least not without someone noticing.

Have You Already Been Goodharted?

It's usually easy to spot once you know what you're looking for:

• Is there a metric that's been hitting target reliably for a long time while the outcome it's supposed to represent hasn't improved? That's the signature.
• When a number improves, do you know which behavior produced the improvement? If you can't name it, you don't actually know what you bought.
• Ask a manager what they'd do to hit a target if they were behind with two weeks left. Their honest answer is your gaming path, and it's already being used.
• Does anyone talk about the metric as though it were the goal, rather than a proxy for it? Once "we need occupancy up" has replaced "we need the asset performing," the substitution has already happened.

The Takeaway

Reporting feels like the safest, most neutral thing finance does. It's actually one of the most consequential, because every number you elevate into a target starts reshaping the behavior underneath it, and the reshaping happens quietly and in good faith. The team isn't cheating you. They're doing what you asked, and the problem is what you asked.

So the useful question isn't "are our numbers accurate," it's "what business are our numbers building." Choose the metrics deliberately, pair them so gaming one exposes the other, and keep saying out loud what the real goal is, because a proxy left unattended long enough will replace it. Getting a portfolio-wide view where those pairs can actually be seen together, rather than assembled from separate reports weeks after the behavior happened, is much of what a connected operating model, and platforms like RIOO, are for. The related trap of treating door count itself as the measure of success is taken up in the real unit economics of property management, and the mechanics of building reporting that actually shows you the whole picture are covered in advanced reporting in property management.

FAQ

1. What is Goodhart's Law?
It's the observation, made by economist Charles Goodhart in 1975 and later phrased by Marilyn Strathern, that when a measure becomes a target, it ceases to be a good measure. Once people are held accountable for a number, they optimize for the number rather than the outcome it was standing in for, and the number stops reliably telling you what it used to.

2. How does Goodhart's Law apply to property management metrics?
Every property KPI is a proxy for something you actually care about. Occupancy stands in for a healthy asset; ticket close rate stands in for maintenance being done. Once those become targets, teams can hit them in ways that damage the underlying goal, filling units with concessions and weak applicants, or closing tickets without resolving the problem.

3. Does this mean we shouldn't set targets at all?
No. Targets are necessary. The point is that no single metric can carry a target safely, because every proxy has a gap between it and the real goal, and pressure finds that gap. The fix is to design the reporting so that gaming one number becomes visible in another, not to abandon measurement.

4. How do I stop a metric from being gamed?
Pair it with the metric it would harm if gamed, and report them together. Occupancy with effective rent. Speed to lease with six-month delinquency. Ticket close rate with reopen rate. If someone hits the first number by damaging the business, the paired number moves the wrong way and the trade becomes visible immediately.

5. Why is this a finance problem rather than an operations problem?
Because the reporting pack is the company's real incentive system. Whatever finance chooses to report and hold people accountable for is what managers will optimize toward, whether or not anyone intended it as an incentive. If the metric set wasn't designed deliberately, the behavior it produces was designed by accident.