Art Woolf is having trouble posting to the list but sent me an email noting that there was a recent article in the JEH on the regulation of margarine. I found the reference with a quick search it's
Dupre, Ruth. 1999. "'If It's Yellow, It Must Be Butter:' Margarine Regulation in North America Since 1886," Journal of Economic History 59(2): 353-71. Alex -- Dr. Alexander Tabarrok Vice President and Director of Research The Independent Institute 100 Swan Way Oakland, CA, 94621-1428 Tel. 510-632-1366, FAX: 510-568-6040 Email: [EMAIL PROTECTED]