the crown prince was in a generous mood on his visit to the White House in November, promising investments of $1tn in the US without offering further details. But behind the scenes, the PIF is said to be running low on cash. Falling oil revenues have drilled an enormous hole in its accounts. Its portfolio is littered with expensive investments that have failed to bear fruit: a cruise line that owns one ship, an electric vehicle business yet to sell a car. International investors are being told that there is no new money available as it undergoes what is euphemistically described as a “restructuring”.