In the past, oil crisis were associated with a sharp increase of the barrel price, as at the beginning of the Seventies or in 1979, which had generated an inflationist wave, followed by a restrictive action by the central banks. Through a sharp augmentation of their interest rates, they had caused recessions. These last days, it is the fall of the barrel value, between 30 and 40%, which generates a deep worry. Financial markets, already affected by the corona virus epidemic, have plummeted and the trend was amplified by the American president declarations. Oil company shares or industrial equipments for ...