Alarm bells are ringing on Wall Street. The recent collapses of Tricolor, a used car seller and sub-prime auto lender, and First Brands, an auto parts supplier, have put the finance industry on edge, almost two decades after problems in the sub-prime mortgage lending market set the stage for the global financial crisis.“When you see one cockroach, there are probably more,” Jamie Dimon, the JPMorgan Chase CEO, ominously cautioned analysts this week, after the US’s largest bank disclosed a $170m c...