Economic surplus analysis model (MODEXC)

The economic surplus model MODEXC is a useful tool for estimating several indicators that will help prioritize technologies (ex?ante analysis) and then evaluate them after their adoption and dissemination (ex?post analysis). This last version of MODEXC not only calculates the total surplus attributable to the series of technologies under study, but also estimates individual technological benefits attributable to a given technology and dístributes them between producers and consumers. This manual refers exclusively to the latest version of MODEXC, which runs in Excel. MODEXC can also be used with Lotus 1?2?3 (English versions 3 and 4). For the numerous researchers in Latin America and the Caribbean, Excel and Lotus 1?2?3 are the calculation programs most widely available and easily accessible. The speed with which information is processed will basically depend on the hardware and on the version of software used. MODEXC can be run in Lotus 1?2?3, versions 1 and 2, using the file MODEXC2.wk1, and with versions 3 and 4 using the fíle MODEXC3.wk3. The MODEXC version for Excel 97 corresponds to the file MODEXC.xIt. This tool can also be used in market analysis, even in situations where technological change is absent; equity, or how the benefits of technological change are distributed among the diferente social groups; technological compotents (new variety, new imput or practices); and spillovers, or indirect effects.