The music used by The Economist newspaper to open and close a podcast is by the Penguin Cafe Orchestra, called Perpetuum Mobile. It's on several albums, one of which is Preludes Airs and Yodels (A Penguin Cafe primer).
Why post this? Because I couldn't find this information when searching the web and never got a response from the Economist when I wrote to ask them the answer. Many thanks to David MacKay for identifying the track.