Oil convenience yields estimated under demand/supply shock
This paper extends the call option model of Milonas and Thomadakis (1997) to estimate oil convenience yields with futures prices. We define the business cycle of a seasonal commodity with demand/supply shocks and find that the convenience yield for crude oil exhibits seasonal behavior. The convenience yield for West Texas Intermediate (WTI) crude oil is the highest in the summer, while that for Brent crude oil is the highest in the winter. This implies that WTI crude oil is more sensitive to high summer demand and that Brent crude oil is more sensitive to shortages in winter supply. Convenience yields are negatively related to the inventory level of the underlying crude oil and positively related to interest rates due to the business cycle. We also show that convenience yields may explain price spread between WTI crude oil and Brent crude oil. Our computed convenience yields are consistent with Fama and French (1988) in that oil prices are more volatile than futures prices at low inventory level, verifying the Samuelson (1965) hypothesis that future prices are less variables than spot prices at lower inventory levels.
KeywordBusiness cycle Convenience yield Demand/supply shock Theory of storage Two-period model
We acknowledge the financial support from National Science Council of R.O.C. (Grant No: NSC 90-2416-H-032-002).
- Brennan MJ (1986) The cost of convenience and the pricing of commodity contingent claims. Working Paper, University of British ColumbiaGoogle Scholar
- Brennan MJ (1991) The price of convenience and the valuation of commodity contingent claims. In: Lund D, Oksendal B (eds.), Stochastic models and options values. Elsever North HollandGoogle Scholar
- Casassus J, Collin-Dufresne P (2005) Convenience yields implied from interest rates and commodity futures. Forthcoming J FinGoogle Scholar
- Heinkel R, Howe M, Hughes JS (1990) Commodity convenience yields as an option profit. J Futures Markets 10:519–533Google Scholar
- Keynes JM (1930) A treatise on money. Harcourt Brace, New YorkGoogle Scholar
- Samuelson PA (1965) Proof that properly anticipated prices fluctuate randomly. Industrial Manag Rev 6:41–49Google Scholar
- Working H (1949) The theory of the price of storage. Am Econ Rev 39:1254–1262Google Scholar