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Risk-Adjusted Pricing

Risk-adjusted pricing model — instantiates Adverse Selection Filtering

Sets each entrant's price to their assessed risk so no hidden type enters a flat premium that quietly subsidizes them — and sets the deliberate cross-subsidy range the pool is willing to hold.

Risk-Adjusted Pricing keeps everyone in one pool but stops the pool from being a bargain only for its worst risks. It maps each entrant's assessed risk to their price, so a flat premium can no longer silently subsidize the high-risk type while overcharging the low-risk one and driving it away. Its distinctive move among its siblings is that the price itself is the filter — not exclusion, not a separate pool, not a self-selection menu — and its second, inseparable job is to set the cross-subsidy range: how much deliberate flattening, how much solidarity, the pool chooses to preserve on top of pure risk-pricing. It is a model, not a gate: everyone can enter, but the terms are tuned so that entry is fairly priced rather than pooled on assumptions that fit no one.

Example

Flood insurance shows the failure it exists to prevent. If every property in a county pays the same premium, low-risk inland owners overpay and drop out while repetitive-loss coastal properties — who know their risk — pile in, and the pool spirals toward the worst risks it retains. Risk-adjusted pricing, as in the U.S. National Flood Insurance Program's move to property-level rating, prices each home to its modeled flood risk, so the offer stops attracting only the properties for whom a flat rate was a windfall. But the program also makes a deliberate cross-subsidy choice: caps on how fast any one premium can rise year to year, so existing homeowners aren't priced out overnight. That cap is not a modeling error — it is the pool stating how much solidarity it will hold while the price migrates toward risk.

The result is a single pool whose composition no longer drifts, because the price of entering now reflects what entering actually costs.

How it works

  • Map risk to price. An assessed risk score is converted to a premium through a pricing function, so the term each entrant faces tracks the exposure they bring.
  • Set the slope. How steeply price rises with risk is chosen deliberately — the steeper the slope, the more precisely the pool is protected, but the less pooling survives.
  • Set the cross-subsidy band. The model states how much deliberate flattening or solidarity to keep, via caps, floors, or glide paths, rather than leaving cross-subsidy to accident.
  • Recalibrate. As risk data updates, the pricing function is refreshed so the terms don't drift out of line with reality.

Tuning parameters

  • Price-to-risk slope — how hard the price tracks risk. Steeper protects the pool but dissolves pooling and can price out high-need entrants.
  • Cross-subsidy band — how much subsidy from low to high risk the pool deliberately holds; the solidarity dial.
  • Rate-change caps — limits on year-over-year movement; they soften transitions but slow the correction.
  • Floors and ceilings — minimum and maximum prices, which bound both windfalls and unaffordability.
  • Refresh cadence — how often the pricing function is recalibrated against new risk and loss data.

When it helps, and when it misleads

Its strength is that it halts the flat-rate subsidy that attracts the worst risks and repels the best, keeping a single pool's composition stable without excluding anyone — and it makes the cross-subsidy an explicit choice rather than an accident. It is the right tool when a pool must stay unified but a uniform price is quietly selecting against it.

Its central weakness is symmetric to its strength: a slope set too steep prices out legitimate high-need entrants and dissolves intentional risk-sharing, and because it prices from soft risk estimates, an error in the estimate propagates straight into the terms. The classic misuse is chasing losses with ever-steeper prices, which drives out the good risks and accelerates the very collapse it was meant to prevent.[1] The discipline that keeps it honest is to bound the cross-subsidy deliberately, keep the risk model calibrated (it consumes the recalibrated base rates from experience rating), and treat solidarity as a policy choice rather than residue.

How it implements the components

Risk-Adjusted Pricing realizes the pricing-and-solidarity side of the archetype:

  • term_adjustment_rule — the rule mapping assessed risk to price is the primary adjusted term, tuned so no hidden type enters on pooled assumptions that don't fit it.
  • cross_subsidy_policy — the explicit decision of how much cross-subsidy the single pool deliberately holds.

It prices from a risk estimate it does not produce — that comes from Underwriting Review and the recalibrated base rates of Claims or Outcome Experience Rating. It does not split entrants into separate pools (Risk Tier Assignment) or use self-selection cost-sharing (Deductible or Copay Schedule).

References

[1] The adverse selection death spiral is the self-reinforcing collapse where rising prices drive out the lowest-risk members, which raises the pool's average cost, which forces prices higher again. Risk-adjusted pricing is both the standard defense against it and, if the slope is set to chase losses rather than reflect risk, a way to accelerate it. ↩