The long shadow of the future hangs over any transaction with your local shopkeeper. He surely knows that in making a quick buck now by ripping you off he risks losing all future purchases you might make. What is miraculous is that in modern society you can trust and be trusted by a shopkeeper you do not know. Almost invisible, the guarantors of trust lurk beneath every modern market transaction: the sealed packaging, the warranty, the customer feedback form, the consumer legislation, the brand itself, the credit card, the ‘promise to pay the bearer’ on the money. When I go into a well-known
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