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Discusses the differences between private and social returns and describes an economic framework for assessing a project's social return [known as the economic rate of return (ERR)]. The framework begins by analyzing the impact of a new project on private financiers [the private return known as the financial rate of return (FRR)]. The framework then identifies other stakeholders who might be affected, directly or indirectly, by the project and examines the project's impact on each group. Assumes readers have a working knowledge of cost-benefit analysis, microeconomics, and basic valuation mechanics.

In September 1998, Paul Cooper, Tate & Lyle's finance director for international investments, asked the International Finance Corp. (IFC) to consider lending up to $45 million to finance a $90 million sugar mill in northern Vietnam. Ewen Cobban, an IFC agricultural specialist, was in charge of reviewing the proposal and making a loan recommendation to senior management. Cobban's main concerns were whether the plant was commercially viable and whether it had support from the government. He also feared that world sugar prices were falling and that sugar was a protected commodity. Before he could recommend approval, he had to determine whether they were temporary or permanent problems. Cobban also knew he would have to assess the project's developmental impact. The IFC only supported projects that contributed to sustainable development, and one of the key determinants of sustainability was the degree to which the project was "fair" to all parties involved. Thus, Cobban would need to assess not only the private returns, but also the social returns as measured by the project's economic rate of return (ERR). To do so, he would have to consider the various groups affected by the project and, where possible, quantify the impact on them.