This paper analyses the effect of retirement on cognitive functioning using a longitudinal survey among older Americans, which allows controlling for individual heterogeneity and endogeneity of the retirement decision by using the eligibility age for social security as an instrument. The results highlight a significant negative effect of retirement on cognitive functioning. Our findings suggest that reforms aimed at promoting labour force participation at an older age may not only ensure the sustainability of social security systems but may also create positive health externalities for older individuals.
This study has two principal objectives. The first objective is to measure and compare the performance of European railways. The second objective is to illustrate the usefulness of econometric distance functions in the analysis of production in multioutput industries, where behavioural assumptions such as cost minimization or profit maximization, are unlikely to be applicable. Using annual data on 17 railways companies during 1988-1993, multioutput distance functions are estimated using corrected ordinary least squares (COLS). The resulting technical efficiency estimates range from 0.980 for the Netherlands to 0.784 for Italy, with a mean of 0.863. The distance function results are also compared with those obtained from single-output production functions, where aggregate output measures are formed using either total revenue or a Tornqvist index. The results obtained indicate substantial differences in parameter estimates and technical efficiency rankings, casting significant doubt upon the reliability of these single-output models, particularly when a total revenue measure is used to proxy aggregate output.
The World Bank Institute was established by the World 13an!; in 1955 to train oificials coineern.cd with development planning, policymaking. nsestnient analysis, and project implemcntation In member developing countries At present the substance of WBI's ssork cnmphaslzes macroeconomic and sectoral policy analysis. Through a variety of courses, scmin.rs., sorkshops. and other learninp activities, most of which are given overseas in coopcration witl localinstitutions. NWBI sceks tosharpin analytical skills used in policy analysis and to broaden undcrstandtiri (if the CxpCriciCee Of 1ndis Id&L! countries with economic and social developmnmt. Although WRi's publitatioIs aue designed to support its training activities, many are of interest to a much broader audience This report has been prepared by the staff of thc World Bantk The judgments cxpresscd di niLt necessarily rcflect the views of the Board of Executivc Dircc.or, or ortthe goxernments they represent The material in this publication is copyrighted The World Bi,nl CnLouraocs disseinnation ot ts work and will normally grant permission promptly. Permission to photocopy items for intemal or personal use I or th minternal or personal usc ot spectCtL clients, or for educational classroom use is granted by the Wotd Ban!,, provided that the appropriatc fee is paid directly to the Copyright Clearance ('enter, Inc ,2'2 Roscs otid Dn%e, Danters., MA 01 923, U S A., telephone 978-75t)-8400, fax 978-750 "70) t'leasc contact thei Cop) rihlit Clearance CentLr beforc photocopying items For permission to reprint individual articles or LhdpterS. please fax 3our request with comprL'2 information to the Republication Department, Copyright Clcarancc ('enitr, tax 978-750-4470 All other queries on rights and licenses shouli' h. addres.Ld to the World Bank at the address Ubos or faxed to 202-522-2422 The backlist of publications by the World Ban! is shosso in mthe amiual h,iden of PithlIi otio.Js whizh
This paper investigates the relationship between the concept of activity (including both
professional and nonprofessional) and cognitive functioning among older European individuals. In
this research, we used data collected during the first wave of SHARE (Survey on Health, Ageing and
Retirement in Europe), and a measurement approach known as stochastic frontier analysis, derived
from the economic literature. SHARE includes a large population (n > 25,000) geographically
distributed across Europe, and analyzes several dimensions simultaneously, including physical and
mental health activity. The main advantages of stochastic frontier analysis are that it allows
estimation of parametric function relating cognitive scores and driving factors at the boundary and
disentangles frontier noise and distance to frontier components, as well as testing the effect of
potential factors on these distances simultaneously. The analysis reveals that all activities are
positively related to cognitive functioning in elderly people. Our results are discussed in terms of
prevention of cognitive aging and Alzheimer’s disease, and regarding the potential impact
that some retirement programs might have on cognitive functioning in individuals across Europe.
This paper analyses the effect of retirement on cognitive functioning using a longitudinal survey among older Americans, which allows controlling for individual heterogeneity and endogeneity of the retirement decision by using the eligibility age for social security as an instrument. The results highlight a significant negative effect of retirement on cognitive functioning. Our findings suggest that reforms aimed at promoting labour force participation at an older age may not only ensure the sustainability of social security systems but may also create positive health externalities for older individuals.
Charcot-Marie-Tooth disease type 1C (CMT1C) is caused by mutations in the small integral membrane protein of the lysosome/late endosome (SIMPLE). We analyzed the coding sequence of SIMPLE in DNA of 53 unrelated cases of dominant demyelinating CMT disease with no mutations in PMP22, GJB1, MPZ, EGR2, and NEFL genes. Four different missense mutations were observed in six families. The mutation Gly112Ser was found in two families confirming its frequent occurrence in SIMPLE mutations. Three novel mutations were also identified: Ala111Gly (two families), Pro135Ser, and Pro135Thr. Familial studies revealed that all carriers of mutations (n = 38), aged from 1 to 78 years, were symptomatic, notably children under 10 years (n = 8). Motor conduction velocities in the median nerve ranked from 16.4 to 32.8 m/s (n = 20). In our series of 968 unrelated dominant demyelinating CMT cases (1992-2005), the percentage of SIMPLE mutations was 0.6 (6/968).
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