Concording U.S. Harmonized System Categories Over Time

14 Pages Posted: 9 May 2012

See all articles by Justin R. Pierce

Justin R. Pierce

Board of Governors of the Federal Reserve System

Peter K. Schott

Yale University - School of Management; National Bureau of Economic Research (NBER); Yale University - Cowles Foundation

Multiple version iconThere are 3 versions of this paper

Date Written: April 10, 2012

Abstract

Monitoring changes to product classification systems is an important component of a wide range of empirical research. In this paper we develop an algorithm for concording periodic revisions to the ten-digit Harmonized System (HS) codes used by U.S. statistical agencies to categorize international trade since 1989. We use this algorithm to construct the first comprehensive concordance of HS codes over time, and show how this concordance can be extended to incorporate future revisions. We then characterize the extent of HS-code changes since 1989 and discuss how controlling for these revisions is critical for understanding the growth of U.S. trade. Lastly, we highlight the general applicability of the algorithm to other national and international product classification systems.

Keywords: International trade, product classification

JEL Classification: F1

Suggested Citation

Pierce, Justin R. and Schott, Peter K., Concording U.S. Harmonized System Categories Over Time (April 10, 2012). FEDS Working Paper No. 2012-16, Available at SSRN: https://ssrn.com/abstract=2054762 or http://dx.doi.org/10.2139/ssrn.2054762

Justin R. Pierce (Contact Author)

Board of Governors of the Federal Reserve System ( email )

20th Street and Constitution Avenue NW
Washington, DC 20551
United States

HOME PAGE: http://www.justinrpierce.com/

Peter K. Schott

Yale University - School of Management ( email )

135 Prospect Street
P.O. Box 208200
New Haven, CT 06520-8200
United States
203-436-4260 (Phone)
203-436-6974 (Fax)

HOME PAGE: http://www.som.yale.edu/faculty/pks4

National Bureau of Economic Research (NBER)

1050 Massachusetts Avenue
Cambridge, MA 02138
United States

Yale University - Cowles Foundation

Box 208281
New Haven, CT 06520-8281
United States

Here is the Coronavirus
related research on SSRN

Paper statistics

Downloads
30
Abstract Views
414
PlumX Metrics