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PRINCETON (US)—An analysis of public opinion polls and terrorist activity in 143 pairs of countries has shown for the first time that when people in one country hold negative views toward the leadership and policies of another, terrorist acts are more likely to be carried out.

Princeton University economist Alan Krueger has found that there is a strong relationship between attitudes expressed toward a foreign country—indicated in surveys on foreign leaders’ performance—and the occurrence of terrorism against that country. The research is detailed in the Sept. 18 issue of the journal Science.

“Public opinion appears to be a useful predictor of terrorist activity,” says Krueger, the Bendheim Professor in Economics and Public Policy who is currently on leave from Princeton, working as the assistant secretary for economic policy and chief economist at the U.S. Department of Treasury.

“This is the first study to relate public opinion across countries to concrete actions such as terrorism,” he adds.

Until now, the notion that public attitudes can contribute to terrorism has been inadequately explored, Krueger notes. The study’s findings are significant, he says, because public opinion provides a valuable early warning signal of terrorism and helps researchers better understand the causes of terrorism.

The researchers carried out their study by mining public opinion polls of residents in 19 countries in the Middle East and northern Africa conducted by Gallup. Respondents were asked whether they approved of the job performance of the leaders of nine large countries. Those countries, selected because they are world powers in terms of size, population or military strength, are the United States, Canada, China, France, Germany, India, Japan, Russia, and the United Kingdom.

The opinions, both positive and negative, were then linked to the number of terrorist attacks conducted against the nine world powers by people from the 19 countries between 2004 and 2008. The terror attacks were compiled by the National Counterterrorism Center.

In findings that are consistent with his earlier work, Krueger says there is not a direct connection between poverty and terrorism, contrary to a popular view. Economic status has more to do with target countries than it does with the states where the attacks originate, according to Krueger. Countries with advanced economies as well as a high degree of civil liberties, he says, are most likely to be the targets of terrorism.

The study does not explain whether terrorists act in response to public opinion or whether they are simply reacting just like the larger public to external events, he notes. In either case, however, he says that public opinion surveys can provide a powerful indication of the likelihood of terrorist activity.

Krueger hypothesizes that greater disapproval of another country’s leaders or policies may result in more terrorist acts because it increases the number of people who provide material support and encouragement for terrorism, and increases the number of people interested in joining cells and carrying out terrorist acts themselves.

Extending the analysis, the researchers proposed that new leadership and policies in a country—such as the election of President Barack Obama in the United States—might change opinions in other countries and alter terrorist activity.

Krueger has published many papers about the origins of terrorism, and he has urged terrorism experts to apply the rigorous techniques of social science to questions concerning terrorism and its effects.

The research was conducted while Krueger was at Princeton and submitted before he assumed his position with the government. The contents of the paper do not necessarily reflect the views of the U.S. government. Work on the project was partly supported by a grant from the European Commission to the European Security Economics project.

Princeton University news: www.princeton.edu/main/news