Here is the interview, courtesy of American Public Media:
You can read the full text on the Marketplace website; the listeners' limericks can be found here.
A limerick's hard to complete/In the space of a typical tweet/Haiku, it is true/Are simpler to do/But not a remarkable feat. #NYCpoetweet— Dr. Goose (@DrGooseEcon) April 6, 2012