NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Re-Assessing the U.S. Quality Adjustment to Computer Prices: The Role of Durability and Changing Software

Robert C. Feenstra, Christopher R. Knittel

NBER Working Paper No. 10857
Issued in October 2004
NBER Program(s):   PR

In the second-half of the 1990s, the positive impact of information technology on productivity growth for the United States became apparent. The measurement of this productivity improvement depends on hedonic procedures adopted by the Bureau of Labor Statistics (BLS) and Bureau of Economic Analysis (BEA). In this paper we suggest a new reason why conventional hedonic methods may overstate the price decline of personal computers. We model computers as a durable good and suppose that software changes over time, which influences the efficiency of a computer. Anticipating future increases in software, purchasers may "overbuy" characteristics, in the sense that the purchased bundle of characteristics is not fully utilized in the first months or year that a computer is owned. In this case, we argue that hedonic procedures do not provide valid bounds on the true price of computer services at the time the machine is purchased with the concurrent level of software. To assess these theoretical results we estimate the model and find that before 2000 the hedonic price index constructed with BLS methods overstates the fall in computer prices. After 2000, however, the BLS hedonic index falls more slowly, reflecting the reduced marginal cost of acquiring (and therefore marginal benefit to users) of characteristics such as RAM, hard disk space or speed.

download in pdf format
   (297 K)

email paper

This paper is available as PDF (297 K) or via email.

Machine-readable bibliographic record - MARC, RIS, BibTeX

Document Object Identifier (DOI): 10.3386/w10857

Published: Re-Assessing the U.S. Quality Adjustment to Computer Prices: The Role of Durability and Changing Software, Robert C. Feenstra, Christopher R. Knittel. in Price Index Concepts and Measurement, Diewert, Greenlees, and Hulten. 2009

Users who downloaded this paper also downloaded these:
Feenstra w5061 Exact Hedonic Price Indexes
Diewert, Heravi, and Heravi w14018 Hedonic Imputation versus Time Dummy Hedonic Indexes
Griliches Hedonic Price Indexes for Automobiles: An Econometric of Quality Change
 
Publications
Activities
Meetings
NBER Videos
Data
People
About

Support
National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138; 617-868-3900; email: info@nber.org

Contact Us