Evan Davis

Now I can broadcast to an audience of several million people on the 'Today' programme. I can talk about the day's news. But on radio, believe it or not, we have notes and scripts. And while we might ad lib the odd wryly amusing asides, they come at the frequency of a suburban bus. About one every 90 minutes.

It is no wonder that bank capital is regulated. When borrowing and lending is profitable, it is tempting for banks to scale up their operations and to borrow and lend too much in relation to their capital, in effect reducing the effectiveness of the potential capital cushion.