In a sparsely decorated corner office of the Danish Public Benefits Administration sits one of Denmark's most quietly influential people. Annika Jacobsen is the head of the agency's data mining unit, which, over the past eight years, has conducted a vast experiment in automated bureaucracy. Blunt, and with a habit of completing others' sentences, Jacobsen is clear about her mission: "I'm here to catch cheaters." Denmark's Public Benefits Administration employs hundreds of people who oversee one of the world's most well-funded welfare states. The country spends 26 percent of its GDP on benefits--more than Sweden, the United States, and the United Kingdom.