Business leaders from two hot investment sectors -- real estate and energy -- discussed possible consolidation in their industries and other trends during two panels at the February 1 Wharton Economic Summit in New York City. The first panel entitled ”Real Estate: Where It’s at and Where It’s Headed. A Discussion with Three Legends ” included William Mack Sam Zell and Mortimer Zuckerman. The second panel ”The State of Energy Investing: What’s Fueling Consolidation? ” included a range of experts who debated the role of private equity and hedge funds in consolidation the rise of both global demand and global players the role of renewable energy and the possibility of a windfall profits tax on energy producers.