It is about 125 years since shipping oil in wooden barrels became obsolete. An oil price above $125 a barrel, however, and speculation that the price could hit $200 are reminders that we have become ever more dependent on the black stuff. Oil is unlikely to hit $200 and remain above it any time soon – but economies would suffer if it did.

The underlying reason for oil’s tenfold price rise in less than 10 years is that demand, not least from China and India, has risen rapidly while supply has not kept pace. That dynamic is different to the supply shocks of the 1970s, but because truck drivers and commuters cannot easily stop travelling, even a small deficit in supply can cause large moves in the oil price.