The Peter Principle in Sales: Research on Promoting Top Reps

Sales organizations promote based on one signal almost every time: who is hitting the number. It feels like the safest, most objective way to decide who runs a team next. Three economists who tested that assumption against real promotion data found it produces almost the opposite of a safe bet.

Alan Benson, Danielle Li, and Kelly Shue tracked 38,843 sales workers across 214 firms and 1,553 promotions into management, publishing the results in the Quarterly Journal of Economics. The same sales performance a company uses to decide who gets promoted turned out to be negatively correlated with how that person performed once they were managing other people. The best sellers got promoted at the highest rates, and on average, they performed worse as managers than the reps who were promoted with weaker sales numbers.

A peer-reviewed study of 38,843 sales workers across 214 firms found that sales performance is negatively correlated with managerial performance, meaning the strongest individual sellers are systematically worse bets for a management promotion than reps with weaker sales numbers. The skills that produce top individual sales performance and the skills that produce strong team management are largely different skills, and promoting on sales performance alone selects for the wrong one.

What the Research Found

The Benson, Li, and Shue study, formally titled “Promotions and the Peter Principle,” is the most-cited empirical test of whether the Peter Principle holds in a real workplace. The Peter Principle itself is an older idea: people get promoted based on performance in their current role until they reach a level where they can no longer perform, and the promotions stop there while the damage from the last one continues.

In sales, the researchers found a measured, statistically significant version of that pattern. The best sellers were promoted at higher rates, an expected result on its own. The unexpected part of the finding is that those same top sellers performed worse as managers than reps who had been less successful in sales. Sales success and managerial performance moved in opposite directions across the dataset. Companies promoting their top reps were, on average, systematically selecting for weaker managers than they would have gotten by promoting someone else.

Why the Underlying Skills Are Different

The mechanism behind the finding is straightforward once it’s named. Being a top rep is a skill set built around the rep’s own performance. Being a strong manager requires a nearly inverse skill set, built around someone else’s performance.

This split, examined in more detail in Gap Revenue Performance, explains why a rep’s closing instinct turns into a liability the moment they are managing other people’s deals instead of their own. A top rep who sees a stalled deal wants to get on the next call and close it personally. A strong manager who sees the same stalled deal wants to coach the rep to handle it themselves. Those are two different reflexes, and the first one does not disappear just because the person’s title changed.

The Cost Compounds Twice

When a top rep gets promoted into a manager role they are not suited for, the organization pays on two separate lines.

The first cost is the lost production. The rep’s territory either sits vacant, gets reassigned to a less productive seller, or gets split across the team, and the revenue that rep was generating slows or stops. The second cost is a critical role, the one every layer of the sales organization depends on, now filled by someone likely to underperform in it. Their team misses, their forecasts drift, and their best reps start looking elsewhere.

The math is direct. Replace a top rep who was producing $5 million a year with a less productive rep producing $3 million, and the organization has already lost $2 million in individual production. Put that same top rep into a management role where the team underperforms by $2 million relative to what it should produce, and the total swing from one promotion decision is $4 million a year. Most companies make this exact trade three or four times a year and never run the math connecting the promotion to the loss.

Why the Mistake Is Hard to Catch

The decision looks right at the moment it’s made. The top rep has earned recognition. The company wants to reward performance, and the standard reward in sales is more money and a bigger title. Promotion to manager checks both boxes at once. Everyone shakes hands and moves on.

The damage shows up later, once the team starts missing and the new manager starts struggling, and by then the connection back to the original promotion decision has gotten hard to trace. The organization tells itself it had a tough quarter, or an unlucky team, or a coaching problem to solve. It rarely traces the outcome back to the decision that produced it, which is why the same company often makes the same promotion mistake again with the next top rep who earns it.

What This Finding Does Not Mean

The finding is not an argument for never promoting a top rep into management. Some do become strong managers. The finding is an argument against using sales performance as the sole or primary criterion for that decision, because the data shows it selects, on average, for the wrong skill set.

The fix is to evaluate managerial fit as its own, separate question from sales performance, using evidence about how a candidate has coached, developed, or lifted other people rather than how well they closed their own deals, the same standard built into ASG’s sales manager training. Strong sales performance does not guarantee strong sales leadership, a gap that shows up broadly whenever individual contributors move into sales leadership roles; the data above is the specific, peer-reviewed mechanism behind it.

Frequently Asked Questions

What is the Peter Principle and does it apply to sales organizations?

The Peter Principle describes the tendency of organizations to promote people based on performance in their current role until they reach a role where they can no longer perform well, at which point the promotions stop but the person remains in a role beyond their capability. In sales, a peer-reviewed study of 38,843 workers across 214 firms found direct, measurable evidence of this pattern in promotions from sales rep to sales manager.

What did the Benson, Li, and Shue study find about promoting sales reps to management?

Economists Alan Benson, Danielle Li, and Kelly Shue tracked 38,843 sales workers across 214 firms and 1,553 promotions into management, publishing their findings in the Quarterly Journal of Economics. They found that the best individual sellers were promoted at the highest rates, and that those same top sellers performed worse as managers, on average, than reps who had been promoted with weaker individual sales numbers. Sales performance and managerial performance were negatively correlated in the data.

Why are top sales reps often worse managers than average performers?

Being a top individual rep and being a strong manager draw on largely different skills. Top reps succeed through personal hustle, resilience to rejection, and a closing instinct built on their own deals. Managers succeed by getting energy from someone else’s win, recognizing patterns across deals they did not personally run, and holding back from taking over a rep’s deal even when they could close it faster themselves. The instinct that makes someone a great closer, wanting to personally take over a stalled deal, works against them once their job is to develop a team instead of closing their own pipeline.

How much does a bad manager promotion cost a company financially?

Using a representative example, replacing a top rep producing $5 million a year with a less productive rep producing $3 million costs an organization $2 million in lost individual production. If the promoted rep then underperforms as a manager and their team produces $2 million less than it should, the total swing from a single promotion decision reaches $4 million a year. Companies frequently make this trade three or four times annually without connecting the loss back to the original promotion.

Does this research mean companies should stop promoting their best sales reps into management?

No. Some top reps do become strong managers. The research argues against using sales performance as the primary or sole criterion for the promotion decision, since the data shows that criterion selects, on average, for weaker managerial performance. It supports evaluating managerial fit as a separate, distinct assessment from sales performance rather than assuming the two are the same skill.

What should companies evaluate instead of sales performance when choosing a new sales manager?

Evidence that a candidate has coached, developed, or lifted other people into stronger performance is a better predictor of managerial success than sales tenure or quota history. A rep who has mentored a newer teammate toward a promotion, or who talks about a colleague’s win with more energy than their own, is showing the reflex a management role requires.

Is the negative correlation between sales performance and managerial performance the same at every company?

The Benson, Li, and Shue research found the pattern held broadly across 214 firms, though the size of the effect varied by company and by how much responsibility the management role carried. The researchers also found that firms placed less weight on past sales performance in promotion decisions when the management role involved more responsibility, suggesting some organizations already sense the risk even without the underlying data in front of them.