What makes a tail price trustworthy?

"Price it and transfer it." I wrote that as the fifth answer to a clearing default. I did not answer the harder question underneath it: how do you actually build a price for something with six recorded instances since 1974?

Most risk models earn trust through long observation histories and independent validation. A genuine tail event doesn't offer that luxury. So what does a trustworthy tail price rest on, if not the volume of history behind it?

You can't sell a price you never had to defend.

There is a discipline built for exactly this case. Sparse, extreme observations, and a price that has to earn its trust somewhere other than in the length of the record. Over the next two weeks I am going to walk through it.

This first appeared on LinkedIn on 8 September 2026. If you want to comment or discuss, that's the place.