@inbook{NBERc5321,
 Crossref = "NBERmill27-1",
 title = "Relations between Prices and Price-Determining Factors: Price Flexibility",
 author = "Frederick C. Mills",
 BookTitle = "The Behavior of Prices",
 Publisher = "NBER",
 pages = "140-151",
 year = "1927",
 URL = "http://www.nber.org/chapters/c5321",
}
@book{NBERmill27-1,
 title = "The Behavior of Prices",
 author = "Frederick C. Mills",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "NBER",
 year = "1927",
 URL = "http://www.nber.org/books/mill27-1",
}