As Protestant Europe, in its own eyes virtuous and thrifty, wrestles with the debt problems of the continent’s Catholic and Orthodox countries, the idea that religious affiliation may influence the way people save, work and spend is more appealing than ever. The toppling of Arab tyrants has lent urgency to a similar enquiry: do Islam and Islamism permit the legal and social conditions that make for prosperity?

Clearly many modern religious leaders have strong ideas about economics. In western Europe, organised Christianity often acts as a modest voice in the ranks of the egalitarian left. This month’s anti-banker protests in London initially found a friendly base for their tent city at Saint Paul’s cathedral. (In recent days, Richard Chartres, the bishop of London, has asked them to leave, while acknowledging that they had raised important issues.) In America religious voices both praise and decry the capitalist order. Also on the borderline between economics and ethics, many religious leaders have taken up the cause of climate change, and urged people to change their behaviour—though this week an Australian cardinal, George Pell, bucked that trend by addressing a group of climate-change sceptics in London.

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