Shiller Says U.S. Needs to Increase Economic Stimulus March 31 (Bloomberg) -- Robert Shiller, chief economist at MacroMarkets LLC and an economics professor at Yale University, talks with Bloomberg's Erik Schatzker about the U.S. economy's need for more stimulus Watch http://www.bloomberg.com/avp/avp.htm?clipSRC=mms://media2.bloomberg.com/cache/vggY0k_gHiDk.asf