The instruments, of course, were CDOs, and not long after Goldman sold a whole of them, the financial system crashed and needed a multi-trillion bailout from which the world has not recovered since.

Ten years later, Goldman is doing it again, only instead of targeting subprime mortgages, this time the bank has focused on quasi-insolvent European banks.

And just like right before the last financial crash, Goldman is once again allowing its clients to profit from the upcoming collapse, or as Bloomberg puts it, "less than a decade after the last major banking crisis, Goldman Sachs and JPMorgan  are offering investors a new way to bet on the next one."

The trade in question is a total return swap, a highly levered product which is similar or a credit default swap but has some nuanced differences, which targets what are known as Tier 1 , or AT1 or "buffer" notes issued by European banks, and which usually are the first to get wiped out when there is even a modest insolvency event (just ask Banco Popular), let alone a full blown financial crisis.