Risk

Parametric Cover and the Basis Risk You Keep

Price the gap between what a parametric contract pays and what your loss actually was — the residual you are keeping whether you priced it or not — and learn the four contract levers that shrink it.

  • Expert
  • 17 min total
  • 16 chapters

What decision this helps you make: Whether to buy a parametric contract instead of, or alongside, indemnity cover, and how to size the retained residual so a payout that arrives correct-per-the-contract does not still leave you short.

What this topic is

Parametric cover is insurance that pays a pre-agreed amount when a measured index crosses a stated threshold, with no claim, no adjuster and no proof of loss. Wind speed at a named station exceeds 96 knots; rainfall at a grid cell falls below a stated millimetre count; a public industry-loss estimate passes a number. The residual left over is the difference between what the contract paid and what you actually lost. That difference is the whole subject: parametric cover does not remove your exposure, it swaps it for a smaller, differently shaped one, and the swap is only good if you can measure what you kept.

Why it matters

Parametric contracts settle in days rather than months, cover losses no adjuster can verify — closed roads, empty hotels, a harvest that simply did not grow — and price transparently off a published index. All of that is real. What is also real is that the correlation between the index and your loss is estimated from history, and it is weakest in exactly the disorderly events the cover was bought for. A firm that treats a parametric payout as full cover has replaced a known, quantified retention with an unknown one, and will discover its size on the worst possible day.

Who should learn it

Owners and finance leaders buying cover for weather, catastrophe, energy price or business-interruption exposure; anyone offered an index-linked contract by a broker; and finance teams that have to explain to auditors why an instrument that pays on an index may not be insurance at all.

What you will understand

  • The three trigger families — physical parameter, modelled loss, and industry index — and the residual each one leaves
  • How to compute the residual distribution for your own exposure, using a payout table and your own loss history
  • How to read a parametric slip: the four clauses that decide whether you get paid at all
  • Why a parametric contract can be a derivative rather than insurance, and what that changes on your accounts

Prerequisites

Common misconception

"Parametric cover is faster indemnity cover." It is not the same product with a shorter settlement. Indemnity cover promises to make you whole up to a limit and spends months establishing what whole means; parametric cover promises a fixed sum on a fixed measurement and never asks what happened to you. That is a different contract with a different residual, and the residual is not small: the same event can produce a full payout with no loss, or a devastating loss with no payout, and both outcomes are the contract working exactly as written. Speed is a genuine benefit. It is not the trade you are making — the trade is certainty of timing against certainty of amount.