On 15 September 2008, capitalism came to a grinding halt. As sub-prime mortgages and toxic securities continued to dominate the headlines well into 2009, the National Theatre asked David Hare to write an urgent and immediate work that sought to find out what had happened, and why. Capitalism works when greed and fear are in the correct balance. This time they got out of balance. Too much greed, not enough fear. Meeting with many of the key players from the financial world, David Hare, author of ''The Permanent Way and Stuff Happens'', has created ''The Power of Yes'': a compelling narrative, as enlightening as it is entertaining. It's like a ship which you're being told is in apple-pie order, the decks are cleaned, the metal is burnished, the only thing nobody mentions, it's being driven at full speed towards an iceberg. Not so much a play as a jaw-dropping account of how, as the banks went bust, capitalism was replaced by a socialism that bailed out the rich alone. ''The Power of Yes'' opened at the National Theatre, London, in September 2009.