Age-Based Preferences in Paired Kidney Exchange

We consider a model of Paired Kidney Exchange (PKE) with feasibility constraints on the number of patient-donor pairs involved in exchanges. Patients' preferences are restricted so that patients prefer kidneys from compatible younger donors to kidneys from older donors. In this framework, patients with compatible donors may enroll on PKE programs to receive an organ with higher expected graft survival than that of their intended donor. PKE rules that satisfy individual rationality, eciency, and strategy-proofness necessarily select pairwise exchanges. Such rules maximize the number of transplantations among pairs with the youngest donors, and sequentially among pairs with donors of dierent age group

INTERNAL LEARNING BY DOING AND ECONOMIC GROWTH

This paper analyses the consequences for growth during the transitional period of considering the learning-by-doing process proposed by Arrow (1962) as internal, instead of as an externality. To do this, it develops a simple endogenous growth model with human capital accumulation through external and internal learning processes. The calibrated model delivers two features of the Japanese growth experience: slow convergence, and negative correlation between the growth rate of per capita GDP and investment share. The crucial implication of internal learning-by-doing is the double role of physical investment that operates reducing diminishing returns to physical capital.Internal LBD, Endogenous Growth, Return to Saving, Convergence Speed, Investment Share and Growth Rate

Econometric testing of spatial productivity spillovers from public capital

In this paper we review two different approaches followed in the empirical literature to test for the existence of public capital spillovers. Additionally, we explore the role played by an additive aggregator of public capital in neighboring regions versus the multiplicative aggregator used previously in the literature. In the empirical application we compare the different methodologies using a panel data set of the 47 mainland Spanish provinces. We do not find evidence of the existence of spillover effects of public infrastructure.Public capital, public infrastructure, spatial spillovers.

Statistical Model Checking of e-Motions Domain-Specific Modeling Languages

Domain experts may use novel tools that allow them to de- sign and model their systems in a notation very close to the domain problem. However, the use of tools for the statistical analysis of stochas- tic systems requires software engineers to carefully specify such systems in low level and specific languages. In this work we line up both sce- narios, specific domain modeling and statistical analysis. Specifically, we have extended the e-Motions system, a framework to develop real-time domain-specific languages where the behavior is specified in a natural way by in-place transformation rules, to support the statistical analysis of systems defined using it. We discuss how restricted e-Motions sys- tems are used to produce Maude corresponding specifications, using a model transformation from e-Motions to Maude, which comply with the restrictions of the VeStA tool, and which can therefore be used to per- form statistical analysis on the stochastic systems thus generated. We illustrate our approach with a very simple messaging distributed system.Universidad de Málaga Campus de Excelencia Internacional Andalucía Tech. Research Project TIN2014-52034-R an

Detecting Technological Heterogeneity in New York Dairy Farms

Agricultural studies have often differentiated and estimated different technologies within a sample of farms. The common approach is to use observable farm characteristics to split the sample into several groups and subsequently estimate different functions for each group. Alternatively, unique technologies can be determined by econometric procedures such as latent class models. This paper compares the results of a latent class model with the use of a priori information to split the sample using dairy farm data in the application. Latent class separation appears to be a superior method of separating heterogeneous technologies.parlor milking system, stanchion milking system, latent class model, stochastic frontier, Production Economics,