The document discusses building an effective network of mobile money agents. It notes that while mobile money allows transactions via phone, users still need agents to convert cash to electronic money and vice versa. A good agent network is ubiquitous, trustworthy, low-cost, and liquid. Mobile network operators' existing airtime distribution networks provide a starting point, but mobile money requires different economics and management due to its two-way liquidity needs. Building a successful mobile money service requires carefully designing and overseeing an appropriate agent network.