“Money doesn’t matter,” Elon Musk said last week. Days later he launched a payments service, X Money, and described himself as a “former trillionaire”. The market had just proved his first point in the least flattering way. SpaceX

The world’s first trillionaire – no longer – has seen his net worth shredded by $850 billion in just over a month as shares in both SpaceX and Tesla tumbled.

Musks wealth peaked at around $1.33 trillion on June 16, when SpaceX shares soared to a lifetime closing high of nearly $202 apiece. However, as the shares crashed, Musks net…