It's 10 years since the Lehman Brothers crash, and all that that brought with it. On Friday   I'm going to see the Lehman Trilogy at the National Theatre , to see how a quality dramatisation of events can shed new light on what happened.  I'm not sure how good it will be for my blood pressure, but I'm looking forward to it in any case. In this post I want to draw attention to another literary work - Payback, by Margaret Atwood.  This was published exactly at the time the world was crashing into financial chaos, and its subtitle is stunningly prescient: Debt and the Shadow Side of Wealth.  I found it a simply…