'This bubble will likely collapse': JPMorgan sounds the alarm on a hugely popular trade that's twice as overstretched as it was before the dot-com crash

· The valuation gap between value and low-volatility stocks has grown twice as large as it was during the height of the dot-com boom.   
· This trend has created an unsustainable "equity factor bubble" that is likely to burst, according to Marko Kolanovic, JPMorgan's global head of macro, quantitative, and derivatives...