Peter Lee sat on the board of PacAdvantage, the largest small-business insurance pool in California, and watched it bleed 150,000 enrollees down to zero. Healthier firms left for cheaper options. Premiums spiked for those who stayed. More firms left. By 2006, PacAdvantage was gone, and Lee called it by its name: a classic death spiral. The force that killed that pool has not gone away. It is sitting in your renewal packet right now.
Most operators who run a small firm have heard some version of the same line: shop the renewal, trust your broker, stay the course. It sounds safe. It is a bet on a pool that shrinks and gets sicker every quarter, and you are the one paying the spread.
The Pattern That Killed the Pool
Harvard economists David Cutler and Richard Zeckhauser spent years studying what happens when people sort themselves across insurance plans. They gave the pattern a name: adverse selection. Healthier, cheaper members leave for better deals. Sicker, costlier members stay. Premiums rise to cover the gap. More healthy members leave. The cycle feeds itself until the pool folds.
They proved it at their own school. When Harvard began putting the same dollar amount toward every faculty plan, the most generous option lost its healthy members fast. Within three years, it was gone. The people who needed it most were the last ones in it, and the math crushed them.
PacAdvantage ran the same script at state scale. Marian Mulkey, a California Healthcare Foundation analyst, wrote that the pool had a built-in flaw: "people will participate only when it is in their best self-interest." The firms with young, healthy workers found cheaper options on the open market. The firms with older or sicker workers stayed. Premiums climbed. More firms left. Lee watched it happen in real time. 150,000 at peak. Zero at close.
There is a name for this in the literature. And auto-renewal does not protect you from it. It locks you into it.
The Spiral Is Running Right Now
KFF studied 318 small-group insurer filings for 2026. The median proposed rate increase: 11 percent. The underlying rise in medical costs: 9 percent. Those two numbers should be the same. They are not.
That two-point gap is not greed. It is the fingerprint of a pool losing its healthiest members. Insurers wrote it down in their own filings, naming enrollment declines and worse risk pool health as direct causes. They are not hiding it. They are documenting it in the rate justifications they submit to state regulators.
The problem is not that your broker is dishonest. The problem is that auto-renewal assumes the pool is stable. It is not stable. It is contracting, and every firm that exits shifts its share of the risk onto you.
The KFF 2025 survey found that 37 percent of small firms now use level-funded plans. In 2019, that figure was 7 percent. ICHRA adoption grew 52 percent in a single year. That is not a slow drift toward new options. That is a mass exit from the fully insured pool. Every one of those firms took their healthier, cheaper employees with them. The firms still auto-renewing are left holding the bag.
The Fix Is Not a Better Broker
The real fix is a decision model that runs before the broker meeting. Not after. Once that is clear, three moves follow from it.
Move 1: Run Three Quotes on One Sheet
Before your next renewal, get three numbers in the same file: the fully insured renewal, a level-funded quote, and an ICHRA allowance model. Level-funded plans set a fixed monthly cost with a stop-loss cap on large claims. If claims come in low, the surplus comes back to you, not the insurer. ICHRA, short for Individual Coverage Health Reimbursement Arrangement, lets you set a fixed tax-free amount for each employee to buy their own plan on the open market. Both are real structures running at scale, not theory.
This is the part that takes work. It means finding a broker or benefits advisor who handles all three structures, not just the one that pays the highest commission. Most firms never take this step, which is why most firms never see the gap.
Move 2: Measure the Gap in Real Dollars
The average annual single premium for a small firm runs near $9,211. Level-funded plans cost an average of 19 percent less than fully insured. On a 10-person team at single coverage, that is roughly $17,500 a year back in your pocket. The number will vary by your claims history and your team's age mix, but the gap is large enough that ignoring it is a choice with a price tag.
Move 3: Lock the Comparison into Your Annual Cycle
Run all three models every year, not once. The pool changes each renewal period. The firms that left last year pushed their risk onto you. One snapshot tells you where you stood. It does not tell you where you stand now. The math keeps moving, so the comparison has to repeat.
What One Cycle Shows
Running this for one renewal period does something the old advice never did.
You see how much of your increase comes from medical costs and how much comes from pool shrinkage. You find out whether your broker quotes all three structures or steers you toward one. You learn if your claims history qualifies you for a surplus refund under level-funding. You stop guessing whether the renewal is fair. You have a number to measure it against.
Three Questions at Renewal
At the end of one cycle, ask three things:
→ What drove the increase: medical trend, pool shrinkage, or both?
→ What looked like a good deal but locked you into a worse pool?
→ What friction came up when you asked for all three quotes?
That is the difference between advice that sounds right and a system that proves itself.
Where You Stand
PacAdvantage covered 150,000 people. Those people trusted the pool. The pool is gone. Your renewal packet is not a routine form. It is a bet on a pool that gets smaller every quarter, and the firms making that bet are the ones left paying for everyone who walked away. Now you know the name of the pattern. Start with what is true. Then build from there.
