Western stocks will fall by 20 percent. Oil will trade at $16 a barrel. Emerging markets will crumble as China assumes the role of Lehman Brothers in the not so eagerly awaited sequel to the 2008 financial crisis.That preview of the next 12 months is brought to you by the Royal Bank of Scotland. “Sell everything except for high-quality bonds,” RBS credit chief Andrew Roberts writes in a note to investors that reads like the voice-over in a trailer of a finance themed horror film. “This is about return of capital, not return on capital. In a crowded hall, exit doors are small."