bernie rostker and professor tammy shultz. thank you. >> thank you. >> thank you. >> ifill: now to cuba, and its changing economy. this weekend, president raul castro told parliament that carrying out his reform agenda is essential, both for economic growth and to preserve socialism. in the first of three reports for our global health unit, ray suarez is just back from cuba to report on how that's working. >> suarez: is cuba ready for big economic change? like everything about this country, it depends on who you ask and where you ask. in havana, rafael hernandez is a political scientist and writer. >> the leadership is realizing that this is a key moment. we cannot postpone these changes. i think that the government is very clear and knowledgeable about that. >> suarez: in miami cuban-born carlos is co-chair of the cuba study group. >> i think the cuban economy is in a free fall. unless the reforms that are made are significant enough, deep enough, structural enough, they're not going to work. we've seen them... we saw them in