Former Goldman Sachs employee Greg Smith has cost the company more than $2 billion in stock value since his op-ed piece ran in the New York Times yesterday. Smith’s very public jump from the company at the top of the Wall Street food chain has raised some questions about Goldman’s internal culture, it’s capacity to learn lessons from past mistakes and it’s ability to control its own brand. The Takeaway co-host John Hockenberry reports from London, where he spoke to banking blogger Joris Luyendijk.