When a banker reminds you of the importance of the simple things in life, you always worry a bit.

Sir, it is always slightly worrisome when a banker, no matter how correct he might be, starts reminding you about the importance of the simple things in life, like Bilal Hafeez of Deutsche Bank does, “Economists have a lot to learn from the ‘The Big Bang Theory’” July 22.

We might take some comfort in that Mr Haafez is a global head of foreign exchange research, and so seemingly has less to do with the day to day activities of Deutsche Bank :-)