For a small band of hedge funds that slapped down prescient bets against the tottering US housing market, the financial crisis was the biggest money-spinner in generations. Some investors think they have now found the next "big short" in the retail industry.

The reshaping of how Americans shop by the internet is accelerating. The US retail industry faces a growing headache, with 10 companies pushed into bankruptcy already in 2017, according to Standard & Poor's. Even Sears, a once mighty department store chain founded in 1886, is now tottering.