Acknowledgement
Archived Content
Information identified as archived is provided for reference, research or recordkeeping purposes. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived. Please "contact us" to request a format other than those available.
The authors wish to thank Wulong Gu, Alla Lileeva, Ryan Macdonald, and Daniel Trefler for helpful comments. We are grateful to Bob Gibson for the creation of the database used in this paper.
- Date modified: