Postprint version. Published in American Journal of Agricultural Economics, Volume 71, Issue 3, August 1, 1989, pages 805-805.
NOTE: At the time of publication, the author Wayne H. Howard was not yet affiliated with Cal Poly.
The definitive version is available at https://doi.org/10.2307/1242038.
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This is a pre-copy-editing, author-produced PDF of an article accepted for publication in American Journal of Agricultural Economics following peer review.