This paper examines the relationship between retail petrol prices, excise duties and crude oil prices in the UK over the period 1973–1988. The existence of a stable relationship between the petrol price, level of excise duty and spot oil price is confirmed through use of the cointegration approach. Although the speed of reaction of petrol prices to changes in the crude price depends on whether crude prices are rising or falling, any asymmetry in the pricing response is virtually absent after an adjustment period of only four months.
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