Bitcoin

If you bought a single Bitcoin, a type of digital currency, on April 13, 2011, it would have cost you $1 US, or about 84 pence on this side of the pond.If you sold it on June 7, 2011, less than two months later, you would have got $29.60 (around £25) for that single Bitcoin, an astonishing gain of almost 3,000 per cent.

The first rule of investing is never to get involved in something you don’t understand. On that basis, the current craze for putting one’s shirt on so-called Non-Fungible Tokens ought to have come and gone within a week.