PacAdvantage held twenty health insurers on its rolls in 1992. By 2006, zero remained, and 6,200 California small businesses lost their group coverage in one stroke. The pool did not fail because health care got expensive. It failed because the healthiest employers left first, and every owner who stayed picked up the tab for the ones who walked.
If you run a small firm and auto-renew your group health plan each year without auditing where you sit in the risk pool, you are doing what those owners did. Your broker calls it "staying the course." The research calls it something else.
There is a name for this in the literature.
The Spiral Has a Name
David Cutler and Richard Zeckhauser, both Harvard economists, mapped the pattern in a 1998 paper for the National Bureau of Economic Research. They called it the adverse selection death spiral. The mechanics are plain. When a pool of insured groups is voluntary, the healthiest groups leave first. They can get cheaper rates on their own. The pool that remains is sicker. Costs rise. Premiums rise. More healthy groups leave. The cycle speeds up.
Marian Mulkey, an analyst at the California Healthcare Foundation, said it flat when PacAdvantage closed: "A voluntary program's fundamental flaw is that people will participate only when it is in their best self-interest."
That single line explains why "just renew" is the worst advice a broker can give. The advice does not fail people. It fails the system they are trying to run.
The Spiral Is Running Now
The 2026 rate filings tell the story. The Kaiser Family Foundation reviewed 318 small group insurers across all fifty states. The median proposed increase: 11%. One in ten plans filed for increases of 20% or more. Anthem's small group enrollment fell 11.9% in 2024. The company projects another 10% drop in 2026.
Researchers at Georgetown's Center on Health Insurance Reforms looked at the current small group market and used the exact phrase: "a classic adverse selection death spiral."
The long view is worse. In 2002, 47% of small employers offered health coverage. By 2023, 30%. That is not a trend. That is the spiral's body count over two decades. The National Federation of Independent Business reported in early 2025 that 13% of small owners now cite insurance as their single most important problem. The highest reading since 2018.
The Flaw in the Packet
The problem is not that premiums go up. The problem is that auto-renewal treats a worsening risk pool as if it were stable. Your broker's pay is tied to the renewal. Your interest is a plan that works at a price your firm can carry. Those two interests drift further apart each year the spiral runs.
The Replacement
The better principle is short: stop buying blind inside a pool you have never audited. Once that is clear, three moves follow from it.
Move 1: Audit Your Risk-Pool Position
Pull your claims data from the past three years. Compare your group's age, headcount, and claims history to the pool average. Are you the healthy group paying for the sick pool, or do you need the pool's protections? That question is the one most owners have never asked their broker, and it changes every number that comes after it.
Move 2: Price the Alternative at Your Actual Headcount
Level-funded plans now cover 37% of small-firm workers, per the 2025 Kaiser Family Foundation employer survey. Small business adoption of Individual Coverage Health Reimbursement Arrangements grew 52% from 2024 to 2025, per the HRA Council. These are not fringe products. They are where the healthy groups went when they left the pool you are still in.
Move 3: Set a 90-Day Review Cycle That Starts Before the Renewal Window Opens
Most owners see the renewal packet and react. By then the window for alternatives is tight and the broker controls the frame. Start the review 90 days out. Run quotes, compare structures, and make the call on your terms.
What the System Shows
Running this for one renewal cycle does something the old advice never did.
It shows which costs are pooled risk and which are your firm's actual claims. It shows whether the broker's "best option" was the best option or just the path of least resistance. It shows where the real buying power sits at your firm size. And it shows whether you are funding the spiral or positioned to step out of it.
The Feedback Loop
At the end of the first cycle, ask three things.
→ What moved the number on your per-employee cost?
→ What looked like progress but left no trace in the claims data?
→ What friction showed up more than once in the renewal process?
That is the difference between advice that sounds right and a system that proves itself.
Where You Stand
The owners who stayed in PacAdvantage until the end did not get rewarded for loyalty. They got the final bill. The spiral does not announce itself. It arrives as a renewal packet that looks routine. Now you know the name of the thing the packet is asking you to fund.
