Housing Economist and Director of The Paul Milstein Center for Real Estate Chris Mayer has joined an online discussion on The Wall Street Journal’s Web site. Along with Celia Chen, director of housing economics for Moody's Economy.com and Susan Wachter, a professor of real estate, finance and city and regional planning at the University of Pennsylvania's Wharton School, the group discusses different factors affecting the nation’s economy in light of the current state of the housing market. Click here for the econoblog: http://online.wsj.com/article/SB116100680840693865.html