Evan Davis presents the business magazine. The stock markets have crashed, risen and then crashed again. It has been a tough year for shareholders and pension owners alike, but how does it affect companies and the people who run them? Evan talks to the bosses of confectionery giant Cadbury and insurance group Aviva to find out what they do when their market value plunges. He also quizzes them about compliance, the dreaded word that is on the lips of everyone in business.