Instead of cutting his teeth in the oilfields like Exxon Mobil CEO Rex Tillerson or wildcatting billionaire Harold Hamm, Watson studied agricultural economics and started his oil career as a financial analyst, not a roughneck.

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Colin A. Carter is a professor of agricultural and resource economics at UC Davis.

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"Nobody knows the future, but if the past is any guide, the farmworkers who get legalized, many of them will leave agriculture pretty quickly, " said Philip Martin, professor of agricultural and resource economics at University of California, Davis.

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Dr. Jayson Lusk is Professor and Willard Sparks Endowed Chair in the Department of Agricultural Economics at Oklahoma State University and can be reached at Jayson.

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The Shanghai native, one of the founders of Greenland Group in 1992, had studied economics and management at Shanghai Agricultural Institute.

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Graham Brookes is an agricultural economist with the UK-based consultancy business PG Economics and author of 13 peer reviewed papers on the economic and environmental impact of genetically engineered crops.

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