Bachelier – a strange new world for oil options

Stella Farrington
18 May 2020

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A single, wild trading day in April upset decades of established options pricing practice in oil markets.

When the price of West Texas Intermediate (WTI) oil futures traded at CME plummeted to -$40 a barrel on April 20, the Black-Scholes options pricing model – which cannot compute negative prices – was pushed to its theoretical limits.

CME responded on April 22 by switching to the 120-year old Bachelier options pricing model, which can accept negative prices. Ice Clear Europe followed suit

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