@inbook{NBERc10863,
 Crossref = "NBERpote02-1",
 title = "Defined Contribution Pensions: Plan Rules, Participant Choices, and the Path of Least Resistance",
 author = "James J. Choi and David Laibson and Brigitte C. Madrian and Andrew Metrick",
 BookTitle = "Tax Policy and the Economy, Volume 16",
 Publisher = "MIT Press",
 pages = "67-114",
 year = "2002",
 month = "January",
 URL = "http://www.nber.org/chapters/c10863",
}
@book{NBERpote02-1,
 title = "Tax Policy and the Economy, Volume 16",
 author = "James M. Poterba",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "MIT Press",
 year = "2002",
 URL = "http://www.nber.org/books/pote02-1",
}