Detecting Illegal Arms Trading

I always love it when I see a paper that only an economist could write. An ingenious new study by Stefano DellaVigna and Eliana La Ferrara definitely fits that description.

The issue they tackled is detection of illegal arms trades that defy United Nations embargoes. Their idea was to use the information embedded in stock markets to tease out indirect evidence of the illegal deals. Legitimate weapons dealers that obey the embargoes are hurt by them, while illicit dealers benefit. So DellaVigna and La Ferrara examined how the stock prices of weapons dealers in different countries are affected by events that raised and lowered the likelihood that the embargo will be rescinded. They found that the stock prices of arms sellers in countries more likely to house illicit dealers (e.g. countries with more corruption and less rule of law) rise when events prolong embargoes, whereas stocks of arms dealers in countries like the U.S. fall in response to the same news.

While this is not the sort of evidence you could use to convict somebody, it is an excellent example of what some are calling the “forensic economics” movement. In a column in last week’s Philadelphia Inquirer, the conservative talk-radio host Michael Smerconish called for forensic economists (myself in particular) to apply our tools to terrorism. More to come, perhaps.

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  1. nin says:

    What if US companies also participate in illegal weapons trade but is covered up by the US government because the weapons are going towards a US backed gureilla force that is fighting against *blank* dictator that the US wants to get rid of. Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm………..

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  2. nin says:

    What if US companies also participate in illegal weapons trade but is covered up by the US government because the weapons are going towards a US backed gureilla force that is fighting against *blank* dictator that the US wants to get rid of. Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm………..

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  3. Ed says:

    Very interesting article. I love these articles that find trends in human behavior from public data mining. The idea that such methods could be used in the war on terrorism is also compelling.

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  4. Ed says:

    Very interesting article. I love these articles that find trends in human behavior from public data mining. The idea that such methods could be used in the war on terrorism is also compelling.

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  5. Erik Aronesty says:

    “That’s exactly what drives stock prices – people buying stocks that they *think* will benefit from news and selling those that they *think* will suffer from the same news”

    Yep. Better to analyze earnings (EPS). Easy enough for public companies, where it’s regularly reported. It’s generally a big mistake to use stock prices for data outside of analysis of the stock market itself.

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  6. Erik Aronesty says:

    “That’s exactly what drives stock prices – people buying stocks that they *think* will benefit from news and selling those that they *think* will suffer from the same news”

    Yep. Better to analyze earnings (EPS). Easy enough for public companies, where it’s regularly reported. It’s generally a big mistake to use stock prices for data outside of analysis of the stock market itself.

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