"In Mexico, microenterprises and SMEs make up 99 percent of firms, employ about 64 percent of the workforce, and account for more than 40 percent of GDP. Given the importance of SMEs in the economy, governments in Mexico over the past twenty years have established a wide variety of SME support programs. How effective these SME programs have been in achieving their objectives is unclear.

This paper evaluates SME support programs in Mexico using a panel of firm-level data for two groups of firms-a treatment group that participated in SME programs and a control group that did not. The panel data have been created by linking SME program participation information to a large panel of annual industrial surveys (1994-2005) maintained by Mexico's National Institute of Statistics and Geography."

"Unlike social programs targeting individuals, few enterprise support programs have been rigorously evaluated, and existing evaluations have mostly been done in high-income countries such as the United States and Europe. Mexico spends a large share of government resources on small and medium enterprise programs each year. How effective these programs have been in achieving their objectives is unclear. In Mexico, impact evaluations of small and medium enterprise programs are rare, and most are qualitative in nature. This is the first paper evaluating these programs in Mexico using firm-level panel data. The continuous and ten-year panel data -- from the 1994-2005 period -- allow the authors to address selectivity bias and unobserved firm heterogeneity by applying a generalization of differences-in-differences models combined with propensity score matching methods. This study finds evidence that participation in small and medium enterprise programs is associated with improvements in key variables such as value added, gross production, and wages. Furthermore, the study finds evidence that some of the positive effects can take several years to realize. The results also call for streamlining and greater efficiency in Mexico's small and medium enterprise programs."

"The objective of the study was to rigorously evaluate SME programs in four Latin American countries Mexico, Chile, Colombia and Peru to gain insights into whether SME programs work, which programs perform better than others, and why. This report should be of interest to country governments, policymakers with responsibilities for SMEs, local researchers and the private sector in the region, as well as World Bank staff and bilateral donors."