Main Catalog

The contents of the IED data bank are listed below by topic. For more information about a particular data set, please refer to the associated publications if available or contact the contributor(s). For information on accessing a data set, click here.

The IED makes every effort to obtain and preserve data in their rawest form. Some data sets in the IED data bank are composed of data collected and/or translated from different original sources. For questions regarding the sources or formatting of a particular data set, please refer to the documentation cited in the listing. For more information, send an email to

The data bank currently contains data pertaining to the following topics:

Automotive industry

Title: De Stefano Automotive Data

Time Frame: January 1990 – Dec. 1996 (84 months, 28 quarters)

Documentation: destefanoautomotive.doc

Contributor:Martino De Stefano,, (202) 360-7443

Original source(s): Prices and characteristics come from the Quattroruote (the main monthly automobile publication in Italy) dataset. Quantity data are provided by ANFIA (the Italian Automobile Association). Exchange rate data was obtained from the Pacific Exchange Rate Service at the University of British Columbia, accessible on-line.

Availability: Free access

Title: Rapson/Rice Bresnahan Automotive Data

Summary: A recreation of the data used by Bresnahan (Bresnahan, Journal of Industrial Economics, 1987) to test the hypothesis of tacit collusion in the car industry in the 1950s. According to Bresnahan, the original dataset was destroyed in the San Francisco earthquake of 1989. Data include quantity, price, and automobile characteristics for all cars produced in the U.S. over the studied timeframe. Characteristics include car length, weight, horsepower, number of cylinders, and whether the model is a hardtop. Data also include manufacturer and model names for each car.

Time Frame: 1954-56, annual

Contributors: Dave Rapson,; Brad Rice

Original Source: Car industry trade magazines of the 1950s: Ward’s Automotive, Automotive News, Automotive Industries. See Bresnahan (1987) for details.

Associated Publiscations:

  • Bresnahan, Timothy F. 1987. Competition and Collusion in the American Automobile Industry: The 1955 Price War. Journal of Industrial Economics, 35(4), 457-82.

Availability: Collaborative, maintained by data owner


Title: Rysman 56K Modem Data

Summary: This data set contains information on the adoption of 56K modems by Internet Service Providers in October of 1997. For each ISP, we observe which of two modem technologies the ISP adopted. The data set indicates every telephone switch that can call each ISP so we have a very good measure of the number of competitors faced by each ISP. ISPs vary by size and other technologies, both of which are observed in the data. In addition, there is local demographic data associated with each switch.

Time Frame: October 1997

Documentation: rysman56kdoc.doc. For more information, refer to Augereau, Greenstein and Rysman (cited below)

Contributors: Marc Rysman,

Original Sources: Two directories of ISP’s called “theDirectory” and “Boardwatch”. CCMI provided data on local calling plans. Census data for demographics.

Associated Publications:

  • Augereau, A., Greenstein, S., & Rysman, M. (in press). Coordination vs. Differentiation in a Standards War: 56K Modems. RAND Journal of Economics.
  • Rysman, M., & Greenstein, S. 2005. Testing for Agglomeration and Dispersion. Economics Letters, 86, 405-411.
  • Greenstein, S. & Rysman, M. (in press). Coordination Costs and Standard Setting: Lessons from 56K Modems. In S. Greenstein & V. Stango (Eds.), Standards and Public Policy. Cambridge University Press. [Also CSIO Working Paper #0056, Northwestern University.]

Availability: Free access