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Cash transfers are often a good way for developing countries to address economic and social problems. They are less expensive than directly providing goods and services and allow recipients the flexibility to spend on what they need the most, but for many developing countries, the technical requirements for large-scale programs have been prohibitive. Now, however, biometric technologies have improved and become ubiquitous enough to allow the confident identification and low cost needed to implement successful cash-transfer programs in developing countries. This paper surveys the arguments for and against cash-transfer programs in resource-rich states, discusses some of the new biometric identification technologies, and reaches preliminary conclusions about their potentially very large benefits for developing countries. The barriers to cash-transfers are no longer technical, but political.