A statistical analysis of the economic impact of Maine's mandatory seed potato law was conducted. Results suggest that since the law was implemented, Maine potato yields increased, total Maine potato acreage decreased, Maine seed potato acreage increased, seed potato rejections from certification were reduced, seed potato prices increased, and commercial potato prices decreased. Attempts to estimate the impact on commercial potato quality were unsuccessful. The estimated impact of the Maine mandatory seed law on a typical 200-acre commercial potato grower was an average increase in profits of $14,700 per year since the law was implemented in 1981.

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