Journal Article Substitution and Supply Elasticities in Calculating the Effective Protective Rate: Comment Get access G. Donald Wood, Jr. G. Donald Wood, Jr. Georgetown University Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 84, Issue 1, February 1970, Pages 154–157, https://doi.org/10.2307/1879409 Published: 01 February 1970