MORE religious countries tend to be less innovative, according to a paper published last month by America’s National Bureau of Economic Research. In “Forbidden Fruits: The Political Economy of Science, Religion, and Growth”, Roland Benabou of Princeton and Davide Ticche and Andrea Vindigni of the IMT Institute for Advanced Studies Lucca find a strong negative correlation between innovation, as measured by patents, and religiosity, measured by the share of a population that self-identifies as religious. “I am interested in how people form beliefs that are relevant to economics,” says Mr Benabou. “That thought takes you to belief with a capital B, and that’s religion.”

The authors do not claim to prove that religion causes an innovation deficit. However, they hypothesise that theocratic models of government, in which political leaders are strongly influenced by religious institutions, may provide a channel for anti-scientific views to influence public policy. As examples, they cite the banning of printing in the Ottoman Empire, and the controversial decision by the former American president George W. Bush to limit the federal government’s funding of stem-cell research. Even after taking into account these restrictions, the existence of the United States is still problematic for the theory: a fifth of the world’s GDP comes from a country that is both religious and innovative. And if religion does in fact depress innovation, that does not necessarily mean it is bad for economic growth. After all, faith could quite plausibly offer benefits, such as social cohesion, that outweigh its costs.