Although I'm increasingly skeptical of that argument, as Canadian publishers are able to make a profit tailoring textbooks to a single province, which is a lot smaller than all-America-except-Texas.
As an example: http://www.nelsonschoolcentral.com/cgi-bin/lansaweb?webapp=WSUBDSC+webrtn=subdsc+F(LW3CATURL)=S_S_GENERAL_SCIENCE
Nelson publishes textbooks for just Ontario and just BC. They even publish textbooks for fairly small courses (possibly one section in a bigger school) so very low numbers, but they still manage to be profitable. And there are three other publishers competing for the same markets.
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Although I'm increasingly skeptical of that argument, as Canadian publishers are able to make a profit tailoring textbooks to a single province, which is a lot smaller than all-America-except-Texas.
As an example:
http://www.nelsonschoolcentral.com/cgi-bin/lansaweb?webapp=WSUBDSC+webrtn=subdsc+F(LW3CATURL)=S_S_GENERAL_SCIENCE
Nelson publishes textbooks for just Ontario and just BC. They even publish textbooks for fairly small courses (possibly one section in a bigger school) so very low numbers, but they still manage to be profitable. And there are three other publishers competing for the same markets.
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Prince Edward Island appears to be under the limit, however.