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Genetics-Poverty Link Questioned

Harvard geneticists and anthropologists challenge the work of two economists who say there’s a link between genetic diversity and wealth.

By | February 3, 2013

FLICKR, KEVIN BRIODY Economists at Brown University and Williams College published a paper in this month’s issue of the American Economic Review suggesting that genetic diversity can be linked to economic development and success. Even before the study was published, however, a group of geneticists and anthropologists from Harvard University questioned how the genetic data were applied, and recently published their critique of the work in Current Anthropology.

The thrust of the economists’ claim is that there a sweet spot in terms of the amount of genetic diversity in human populations that leads to economic development.  Too much or too little diversity, they say, results in poverty. Specifically, they write that “the low diversity of Native American populations and the high diversity of African populations have been detrimental for the [economic] development of these regions,” and that “the intermediate levels of diversity associated with European and Asian populations have been conducive for development.”

In their critique, the Harvard group laid out a list of flaws in the data and the researchers’ approach, claiming, for example, that the economists used an inaccurate proxy for genetic diversity of a population. In addition, the Harvard group contends that the the researchers overstated their results, suggesting causation where only correlation exists. “As economists and other social scientists begin exploring newly available genetic data,” the Harvard group wrote, “it is crucial to remember that nonexperts broadcasting bold claims on the basis of weak data and methods can have profoundly detrimental social and political effects.”

The sentiment was echoed by Daniel Benjamin, an economist at Cornell University and a leader in a new field that combines genomics and economics. “It's an area that's fraught with an unfortunate history and ethical quagmires,” he told The Chronicle of Higher Education.  “It's not enough to be careful in the way we use genetic data,” he said. “We need to bend over backwards being careful in the way we talk about what the data means; how we interpret findings that relate to genetic data; and how we communicate those findings to readers and the public.”

 

 

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Comments

Avatar of: W. Boernke

W. Boernke

Posts: 15

February 4, 2013

David Hume long ago argued that humans are psychologically predisposed to think that a correlation means a cause and effect.  Hume went so far as to say that there is no logical reason to think the sun will rise in the east tomorrow simply because it has done so every day in the past.

The authors of this study also commit one of the most common errors in logic: affirming the consequent.

If p, then q.  q.  Therefore, p.  If I am in Kansas, then I am in the United States.  I am in the Untied States.  Therfore, I am in Kansas.

If there are differences in economic development, then I will see differences in genetic diversity in populations.  I see differences in genetic diversity in populations.  Therefore, there are differences in economic development in populations.

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