@techreport{NBERw13646,
 title = "Endogenous Entry, Product Variety, and Business Cycles",
 author = "Florin Bilbiie and Fabio Ghironi and Marc J. Melitz",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13646",
 year = "2007",
 month = "November",
 URL = "http://www.nber.org/papers/w13646",
}