Understanding Basis Risk

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4 min read

Basis risk is the most important concept to master when selling parametric insurance — and the most important one to explain honestly to your clients.

What is basis risk?

Basis risk is the difference between the parametric trigger event and the actual business impact. It manifests in two ways:

  • Over-trigger: The weather event meets the threshold but the client's business is unaffected (they still get paid — which clients rarely complain about)
  • Under-trigger: The business is severely impacted but the weather event doesn't meet the threshold (the client has a real loss and no payout)

    • How to explain it:

    "There's a small but real chance that a storm hits your area, hurts your business, but doesn't quite hit the wind threshold we set — and you don't get paid. We can reduce that risk by choosing the right trigger level and radius, but we can't eliminate it entirely. That's why we price parametric conservatively and combine it with your existing property coverage."

    How to minimize basis risk:

  • Set the trigger radius to match the client's actual weather exposure area
  • Use hyper-local weather stations when available
  • Choose trigger thresholds based on historical revenue impact data, not arbitrary numbers
  • Consider multiple triggers (e.g., wind OR rainfall) to reduce the chance of under-triggering

    • The honest close:

    Clients who understand basis risk and choose parametric anyway are your best clients. They've made an informed decision. They're less likely to dispute claims. And when a payout does happen, they become your strongest referral source.

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