A new academic study suggests United Wholesale Mortgage's 2021 "All-In" broker ultimatum reshaped competition in the wholesale mortgage market in an unexpected way. While the policy forced brokers to choose between doing business with UWM or Rocket Mortgage, researchers found it also prompted competing wholesale lenders that weren't part of the dispute to lower mortgage rates by an average of 5 basis points—a pricing response that persisted for at least four months after the policy took effect.
The research, conducted by University of Kentucky finance professor Spencer Stone, argues the effect wasn't simply about UWM and Rocket. Instead, removing Rocket as an option for many brokers shifted a pool of highly price-sensitive borrowers toward other wholesale lenders. Those lenders suddenly faced more borrowers who actively compared pricing, giving them an incentive to become more competitive themselves.
Rather than raising prices because one major competitor was partially sidelined, Stone found many smaller wholesale lenders actually lowered rates to win that redirected business. The study frames this as an example of an "incomplete exclusivity" agreement creating positive spillover effects for borrowers through competitors that were never party to the agreement.
The ‘Spillover’ Effect
Stone estimates that wholesale lenders excluded from the All-In agreement reduced mortgage rates by roughly 5 basis points compared with their own retail pricing after the policy went into effect.
The reduction appeared immediately after implementation and remained throughout the four-month observation period. The study found no evidence the decline was merely part of an existing pricing trend.
Why did competitors cut prices instead of raising them? Stone's argument rests on the economics of price elasticity.
Before All-In:
- Brokers could shop loans among UWM, Rocket and numerous other wholesalers.
- Rocket had become an aggressive price competitor, growing its wholesale market share from roughly 10% to 25% by offering discounts through brokers.
After All-In:
- Brokers affiliated with UWM could no longer send loans to Rocket.
- Those borrowers still needed financing.
- Many of the borrowers who would have considered Rocket instead flowed toward other wholesale lenders.
Stone argues these borrowers were especially valuable because they were highly price sensitive. In other words, they were the type of consumers willing to shop aggressively for the lowest mortgage rate.
Once that group entered the customer base of smaller wholesalers, those lenders had a stronger incentive to compete on price to win and retain them.
In economic terms, the exclusivity agreement reallocated more "elastic demand" to competing lenders, causing them to lower rates.
The Rate Cuts Came From Lenders — Not Brokers
Stone also tested whether brokers themselves simply reduced compensation.
Instead, he found most of the pricing improvement came through lower interest rates, not merely changes in broker fees, suggesting lenders themselves absorbed the cost.
Nationwide Impact On Pricing
The paper's biggest contribution is explaining why the discounts appeared across the country, even in markets where relatively few brokers were affected by All-In.
Initially, Stone expected lenders to cut rates only in metropolitan areas where the UWM-Rocket conflict had the biggest competitive impact.
“In a world absent pricing frictions, wholesale lenders would only adjust pricing in geographic markets affected by the exclusivity addendum,” Stone wrote, because those were the markets where borrowers were actually displaced.
Instead, he found the pricing response was remarkably uniform nationwide. Even markets with no measured pre-policy overlap saw a pricing effect, while the estimated difference between the most- and least-exposed markets was only about 1 basis point and statistically insignificant.
Stone’s explanation is that lenders face practical and regulatory limits on charging different prices in different markets.
He pointed to earlier Federal Reserve research finding that mortgage origination operates largely as a national market and that differences in local lender concentration had almost no relationship with mortgage rates.
Regulation may also have discouraged geographic price discrimination. Stone found that UWM-Rocket market overlap was significantly associated with the local shares of Hispanic and Asian borrowers. Because pricing practices that create disparate effects across protected groups may raise fair-lending concerns, lenders may have had reason to implement broader pricing changes rather than target discounts only to selected metropolitan areas.
The result was a spillover benefit: borrowers in markets that were relatively unaffected by All-In may still have received lower rates because competing wholesalers applied their pricing response broadly rather than limiting it to markets where UWM and Rocket had competed most directly.
Results Challenge Anti-Trust Theory
The study does not conclude that UWM’s All-In policy was either beneficial or harmful overall. Instead, it shows that exclusive agreements can produce competitive effects beyond the companies directly targeted.
Antitrust analysis often focuses on the rival whose access is restricted—in this case, Rocket Mortgage. But Stone argues regulators should also examine how lenders outside the agreement respond.
“My paper shows that the effects on the firms lying outside the scope of the exclusivity provisions are significant and have real impacts on consumers,” Stone argued. “Thus, anti-trust regulators should consider these effects when evaluating the market impact of exclusive contracts.”
Bottom Line
For mortgage brokers and wholesale lenders, the study suggests UWM's All-In initiative did more than redraw broker relationships—it altered competitive pricing throughout the wholesale channel.
Stone's findings indicate that when one major competitor is removed from part of the market, the remaining lenders don't necessarily gain pricing power. Instead, they may compete even harder for redirected, rate-sensitive borrowers, creating broader pricing benefits that extend beyond the brokers directly affected by the policy.
While the paper focuses on a unique moment in mortgage history, it offers a broader lesson: competitive shifts among the largest wholesalers can ripple through the entire broker channel in ways that ultimately affect pricing for both lenders and borrowers.
