. >> harvard business school lecturer robert pozen looks at the causes of the 2008 financial collapse. he argues for changing the incentive system on wall street and calls for strengthening the government regulation and financial markets. the center for american progress in washington, d.c., host the hour-long event. >> welcome all of you, and i thank sarah and the progressive center for hosting this little discussion group, and i hope it will be very useful. so i'm going to begin with a question to the audience because i believe in audience participation. the question is, what is people's perceptions about how often we have a financial crisis in any place in the world? so does someone want to say whether we have one every 10 years, every 20 years? or let's look at it this way. since world war ii, how many financial crisis do you think that we've had across the world? sir, what do you think? >> every 10 years. >> does anyone think it is more frequent or less frequent? >> more. >> more? more frequent. let's look at some of the numbers here. the left side, we have professional i can dre