Mathieu Lefebvre

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Several years ago we began an international project to study the relationship between social security program provisions and retirement. Under pay-as-you-go social security systems most developed countries have made promises they can't keep. The systems in their current forms are not financially sustainable. What caused the problem? It has been common to(More)
Under income-differentiated mortality, poverty measures reflect not only the "true" poverty, but, also, the interferences or noise caused by the survival process at work. Such interferences lead to the Mortality Paradox: the worse the survival conditions of the poor are, the lower the measured poverty is. We examine several solutions to avoid that paradox.(More)
The occurrence of pancreatic pseudocysts of the right hepatic lobe during acute biliary pancreatitis is a rare event. We report the unusual case of a 69-year-old woman who was hospitalised for biliary pancreatitis. The patient suffered from right hypochondrial pain. A CT-scan performed at day 12 showed pancreatic pseudocysts in the right hepatic lobe. A(More)
Most studies on the role of incentives on risk attitude report data obtained from within-subject experimental investigations. This may however raise an issue of sequentiality of effects as later choices may be influenced by earlier ones. This paper reports instead between-subject results on the effect of monetary stakes on risk attitudes for small(More)
Discussion papers of the WZB serve to disseminate the research results of work in progress prior to publication to encourage the exchange of ideas and academic debate. Inclusion of a paper in the discussion paper series does not constitute publication and should not limit publication in any other venue. The discussion papers published by the WZB represent(More)
Income-di¤erentiated mortality, by reducing the share of poor persons in the population, leads to what can be called the "Mortality Paradox": the worse the survival conditions of the poor are, the lower the measured poverty is. We show that the extent to which FGT measures (Foster Greer Thorbecke 1984) underestimate old-age poverty under(More)
This paper aims at illustrating, in the case of Belgian regions, a specific problem faced by poverty measures. Since mortality is related to the level of income – poor persons tend to die, on average, at younger ages than non-poor persons – poverty measures for the elderly depend not only on what one can call the " true poverty " , but, also, on the(More)
Compensation of executives by means of equity has long been seen as a means to tie executives' income to company performance, and thus as a solution to the principal-agent dilemma created by the separation of ownership and management in publicly owned companies. The overwhelming part of such equity compensation is currently provided in the form of(More)
Classic financial agency theory recommends compensation through stock options rather than shares to induce risk neutrality in otherwise risk averse agents. In an experiment, we find that subjects acting as executives do also take risks that are excessive from the perspective of shareholders if compensated through options. Compensation through restricted(More)