The vector lattice structure of the n-person TU games

We show that any cooperative TU game is the maximum of a finite collection of a specific class of the convex games: the almost positive games. These games have non-negative dividends for all coalitions of at least two players. As a consequence of the above result we show that the class of modular games is a set of generators of the distributive lattice of all cooperative TU games. Finally, we characterize zero-monotonic games using a strong max-convex decomposition.     

The capital gap for small technology companies: public venture capital to the rescue?

In this paper, we analyze effectiveness of public intervention for fostering private venture-capital market in Spain. We use a sample obtained from VentureXpert database, consisting of 755 investments made by 83 Spanish public and private venture capitalists that closed at least one fund between 1997 and 2008. We compare the investments undertaken by private and public investors before and after public venture capital programs were started. We found that Spanish venture-capital market has rapidly developed in the last 10 years and that this development coincides with the establishment of public policies for encouraging technology entrepreneurship. We also found that other factors, such as previous experience of investors and size, have also contributed to fostering more high-risk investments. These results may encourage governments in other countries to start or keep working to promote private venture-capital investments.     

The impact of mobile financial services’ usage on microfinance delinquency

This paper studies the impact of Mobile Financial Systems’ usage on microcredit delinquency ratios in Tunisia by using either a two-part model or matching econometric procedures. Our large dataset contains all of the administrative registers that belong to the six branches of Enda, the incumbent Institution leader in Tunisia. We find a significant reduction of 4.92 days of late repayment for an average user of MFS in an environment where 15% of loans have been paid late at least once. We foresee a tremendous opportunity to improve the MFIs’ repayment ratios and, consequently, provide microcredit customers with more financing for income generating activities.