Almost a year ago, in the middle of the corona virus pandemic, oil price on the American market became briefly negative. In reality, it was a quotation on future markets but that was showing the gap between the too much abundant supply and a weak demand. Stocking capacities were saturated and so buyers were ready to pay in order they were allowed to renouncing to take the deliveries of the black gold they acquired some months before at the agreed date. That unprecedented situation was frequently interpreted as the first signal of the decline of that raw material until then ...