Petrol Price Adjustment : Some Evidence from French Individual Data. Using millions of individual gasoline prices collected over the period 2007-2009, this study highlights several stylized facts on how gas stations adjust their prices in France : retail gasoline prices are changed once a week ; price changes are more frequent on Tuesday and Friday ; local competition has a positive impact on the frequency of price changes ; price changes smaller than 2% are rare ; average price duration and size of price changes are correlated ; gasoline price inflation is mainly driven by variations in the frequency of price increases and decreases. Menu costmodels including information rigidities reproduce most of these stylized facts.En utilisant des m...